Pub Date : 2025-02-16DOI: 10.1016/j.jmmm.2025.172885
Yangrong Chen , Hanchuan Chen , Fei Sun , Yichao Liu , Xiaoxiao Wu , Haitao Li , Zhixing Zhang , Qianhan Sun
Due to the significant applications of static magnetic field invisibility in avoiding metal detector detection, it has received extensive attention in recent years. However, most existing methods (e.g., multilayer closed structures based on DC magnetic metamaterials) achieve closed invisibility, hindering the exchange of information and materials between the cloak’s interior and the external environment. In this study, a DC magnetic field shifter is designed based on transformation magnetostatics and then combined with a specially designed closed DC magnetic cloak with a hole to develop an open static magnetic cloak. Numerical simulations verify the invisibility effect and multi-directional effectiveness of this open cloak. Finally, effective medium theory is utilized to achieve the open static magnetic field cloak by arranging isotropic media specifically, whose effectiveness is validated through numerical simulations.
{"title":"Open static magnetic cloak based on DC magnetic metamaterials","authors":"Yangrong Chen , Hanchuan Chen , Fei Sun , Yichao Liu , Xiaoxiao Wu , Haitao Li , Zhixing Zhang , Qianhan Sun","doi":"10.1016/j.jmmm.2025.172885","DOIUrl":"10.1016/j.jmmm.2025.172885","url":null,"abstract":"<div><div>Due to the significant applications of static magnetic field invisibility in avoiding metal detector detection, it has received extensive attention in recent years. However, most existing methods (e.g., multilayer closed structures based on DC magnetic metamaterials) achieve closed invisibility, hindering the exchange of information and materials between the cloak’s interior and the external environment. In this study, a DC magnetic field shifter is designed based on transformation magnetostatics and then combined with a specially designed closed DC magnetic cloak with a hole to develop an open static magnetic cloak. Numerical simulations verify the invisibility effect and multi-directional effectiveness of this open cloak. Finally, effective medium theory is utilized to achieve the open static magnetic field cloak by arranging isotropic media specifically, whose effectiveness is validated through numerical simulations.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"619 ","pages":"Article 172885"},"PeriodicalIF":2.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-16DOI: 10.1016/j.jmmm.2025.172869
M. Tokaç , H. Pişkin , G. Ekinci , B. Özkal , S. Kazan
The selection of seed and spacer layers is critical in influencing the magnetic properties of thin films, where these layers impact the microstructure, interface quality, and overall magnetic behavior of the thin films. The magnetic properties of Co/Pt multilayers have been investigated where the choice of seed and spacer layers is crucial for tailoring their magnetic properties. These layers influence the interfacial structure, and electronic environment, all of which contribute to variations in the effective demagnetizing field, g-factor, saturation magnetization, and perpendicular surface anisotropy constants. Ferromagnetic resonance has been used to investigate the enhancement of the Gilbert damping parameter, where the damping parameter is higher for the Cu/Co/Pt multilayers across the entire Co thickness range. In contrast, the presence of W layers on both sides of the Co layer leads to a reduction in the damping parameter. The higher spin-mixing conductance in the Co/Pt structure is linked to stronger SOC and enhanced orbital hybridization at the Co/Pt interface. As a consequence of their effects on spin–orbit interactions, spin-pumping efficiency, and interfacial quality, our results emphasize the critical role that interface characteristics play in improving damping in Co/Pt systems.
{"title":"The role of W seed and spacer layers on the magnetic properties of Co/Pt multilayers","authors":"M. Tokaç , H. Pişkin , G. Ekinci , B. Özkal , S. Kazan","doi":"10.1016/j.jmmm.2025.172869","DOIUrl":"10.1016/j.jmmm.2025.172869","url":null,"abstract":"<div><div>The selection of seed and spacer layers is critical in influencing the magnetic properties of thin films, where these layers impact the microstructure, interface quality, and overall magnetic behavior of the thin films. The magnetic properties of Co/Pt multilayers have been investigated where the choice of seed and spacer layers is crucial for tailoring their magnetic properties. These layers influence the interfacial structure, and electronic environment, all of which contribute to variations in the effective demagnetizing field, g-factor, saturation magnetization, and perpendicular surface anisotropy constants. Ferromagnetic resonance has been used to investigate the enhancement of the Gilbert damping parameter, where the damping parameter is higher for the Cu/Co/Pt multilayers across the entire Co thickness range. In contrast, the presence of W layers on both sides of the Co layer leads to a reduction in the damping parameter. The higher spin-mixing conductance in the Co/Pt structure is linked to stronger SOC and enhanced orbital hybridization at the Co/Pt interface. As a consequence of their effects on spin–orbit interactions, spin-pumping efficiency, and interfacial quality, our results emphasize the critical role that interface characteristics play in improving damping in Co/Pt systems.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172869"},"PeriodicalIF":2.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-16DOI: 10.1016/j.jmmm.2025.172889
Eric Daniel Imhoff , Andrii Melnyk , Carlos M. Rinaldi-Ramos
Commercial magnetic particle imaging (MPI) tracers are utilized for many applications including as reference materials for comparing tracer performance, but comparative measurements of many tracers on a single imaging platform are uncommon. This study uses relaxometry and 2D imaging in a pre-clinical MOMENTUM scanner to characterize and evaluate the performance of six common commercial tracers for MPI: Synomag-D Plain, Synomag-D NH2, Synomag-D PEG, Perimag, Vivotrax, and Vivotrax Plus. Repeated measurements of samples showed considerable variability while inter-sample differences were generally negligible. Sensitivity between the two modes is strongly correlated while resolution of the two modes was only moderately correlated. Further, relaxometric measurements tend to predict better resolution than is achieved in 2D imaging. All evaluated tracers have resolutions within 1 mm of each other on the MOMENTUM imager. These results illustrate that relaxometer measurements can be used to broadly predict MPI performance but do not accurately recreate the physical processes or differences in hardware and software of MPI. This study provides MPI measurements of tracers that may be useful to researchers while highlighting the challenges of making comparisons between tracers due to variation within samples and across different measurement techniques and instruments.
{"title":"Characterization and evaluation of commercial tracers for x-space magnetic particle imaging","authors":"Eric Daniel Imhoff , Andrii Melnyk , Carlos M. Rinaldi-Ramos","doi":"10.1016/j.jmmm.2025.172889","DOIUrl":"10.1016/j.jmmm.2025.172889","url":null,"abstract":"<div><div>Commercial magnetic particle imaging (MPI) tracers are utilized for many applications including as reference materials for comparing tracer performance, but comparative measurements of many tracers on a single imaging platform are uncommon. This study uses relaxometry and 2D imaging in a pre-clinical MOMENTUM scanner to characterize and evaluate the performance of six common commercial tracers for MPI: Synomag-D Plain, Synomag-D NH2, Synomag-D PEG, Perimag, Vivotrax, and Vivotrax Plus. Repeated measurements of samples showed considerable variability while inter-sample differences were generally negligible. Sensitivity between the two modes is strongly correlated while resolution of the two modes was only moderately correlated. Further, relaxometric measurements tend to predict better resolution than is achieved in 2D imaging. All evaluated tracers have resolutions within 1 mm of each other on the MOMENTUM imager. These results illustrate that relaxometer measurements can be used to broadly predict MPI performance but do not accurately recreate the physical processes or differences in hardware and software of MPI. This study provides MPI measurements of tracers that may be useful to researchers while highlighting the challenges of making comparisons between tracers due to variation within samples and across different measurement techniques and instruments.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"620 ","pages":"Article 172889"},"PeriodicalIF":2.5,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-15DOI: 10.1016/j.jmmm.2025.172857
Changwei Wu, Yun Xie, Weiping Gong
Nonvolatile electrical control of magnetism in two-dimensional (2D) van der Walls heterostructure has sparked significant interest for both understanding the fundamental magnetoelectric physics and device application. Here, using the first-principles calculations, we propose a new multiferroic van der Waals (vdW) heterostructure / based on C2N and ferroelectric (FE) In2Se3 relying on no-transition metals. Upon electron doping, /- maintains nonmagnetic nature, but /- changes into ferromagnetic state. Moreover, the magnetoelectric coupling is enhanced via engineering interlayer distance of /. The magnetic moment of /- reaches 1.0 /e over the electron concentration ranging from 0.1 to 0.4 e per unit cell at an interlayer distance of 3.2 Å. Our results broaden the materials design space for 2D multiferroic materials.
{"title":"Nonvolatile electrical control of magnetism of monolayer C2N via carrier doping in a two dimensional heterostructure","authors":"Changwei Wu, Yun Xie, Weiping Gong","doi":"10.1016/j.jmmm.2025.172857","DOIUrl":"10.1016/j.jmmm.2025.172857","url":null,"abstract":"<div><div>Nonvolatile electrical control of magnetism in two-dimensional (2D) van der Walls heterostructure has sparked significant interest for both understanding the fundamental magnetoelectric physics and device application. Here, using the first-principles calculations, we propose a new multiferroic van der Waals (vdW) heterostructure <span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>N</mi></mrow></math></span>/<span><math><mrow><msub><mrow><mi>In</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>Se</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> based on C<sub>2</sub>N and ferroelectric (FE) In<sub>2</sub>Se<sub>3</sub> relying on no-transition metals. Upon electron doping, <span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>N</mi></mrow></math></span>/<span><math><mrow><msub><mrow><mi>In</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>Se</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span>-<span><math><mrow><mi>P</mi><mi>↓</mi></mrow></math></span> maintains nonmagnetic nature, but <span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>N</mi></mrow></math></span>/<span><math><mrow><msub><mrow><mi>In</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>Se</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span>-<span><math><mrow><mi>P</mi><mi>↑</mi></mrow></math></span> changes into ferromagnetic state. Moreover, the magnetoelectric coupling is enhanced via engineering interlayer distance of <span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>N</mi></mrow></math></span>/<span><math><mrow><msub><mrow><mi>In</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>Se</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span>. The magnetic moment of <span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>N</mi></mrow></math></span>/<span><math><mrow><msub><mrow><mi>In</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>Se</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span>-<span><math><mrow><mi>P</mi><mi>↑</mi></mrow></math></span> reaches 1.0 <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>B</mi></mrow></msub></math></span>/e over the electron concentration ranging from 0.1 to 0.4 e per unit cell at an interlayer distance of 3.2 Å. Our results broaden the materials design space for 2D multiferroic materials.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172857"},"PeriodicalIF":2.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Two-dimensional Janus materials are highly promising for spintronic applications due to their asymmetric structures and tunable properties. This study explores the magnetic properties of the PdSO monolayer induced by dopant elements, using first-principles calculations. The pristine monolayer is a semiconductor with an indirect band gap of 0.90 eV (PBE) and 1.78 eV (HSE06). Pd-vacancies induce half-metallicity and a magnetic moment of 4.00 , while O and S-vacancies reduce the band gap without inducing magnetism. Transition metal doping (V, Cr, Mn, Fe) and non-metal doping (B, C, N, F) significantly alter magnetic properties. Mn-doping creates a diluted magnetic semiconductor, while V, Cr, and Fe-doping results in half-metallicity. Non-metal dopants like B, N, and F induce magnetization, while C-doping leads to a non-magnetic semiconductor state. These results highlight effective strategies for magnetizing PdSO monolayers for spintronic applications.
{"title":"Realizing new Janus 2D spintronic materials from the non-magnetic 1T-PdSO monolayer through vacancy defects and doping","authors":"Lahcen Aznague , Moussa Kibbou , Zakaryae Haman , El-m’feddal Adadi , Ismail Essaoudi , Abdelmajid Ainane","doi":"10.1016/j.jmmm.2025.172848","DOIUrl":"10.1016/j.jmmm.2025.172848","url":null,"abstract":"<div><div>Two-dimensional Janus materials are highly promising for spintronic applications due to their asymmetric structures and tunable properties. This study explores the magnetic properties of the PdSO monolayer induced by dopant elements, using first-principles calculations. The pristine monolayer is a semiconductor with an indirect band gap of 0.90 eV (PBE) and 1.78 eV (HSE06). Pd-vacancies induce half-metallicity and a magnetic moment of 4.00 <span><math><msub><mrow><mi>μ</mi></mrow><mrow><mi>B</mi></mrow></msub></math></span>, while O and S-vacancies reduce the band gap without inducing magnetism. Transition metal doping (V, Cr, Mn, Fe) and non-metal doping (B, C, N, F) significantly alter magnetic properties. Mn-doping creates a diluted magnetic semiconductor, while V, Cr, and Fe-doping results in half-metallicity. Non-metal dopants like B, N, and F induce magnetization, while C-doping leads to a non-magnetic semiconductor state. These results highlight effective strategies for magnetizing PdSO monolayers for spintronic applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172848"},"PeriodicalIF":2.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-15DOI: 10.1016/j.jmmm.2025.172856
Kehan Ren , Qing Li , Shuai Cao , Xiangming Lu , Jiateng Zhang , Shengzhi Dong , Shuai Guo , Renjie Chen , Aru Yan
Grain boundary diffusion is utilized to enhance magnetic properties by modulating the organizational structure of the magnet surface layer and optimizing the grain boundary structure. In this study, diffusion sources of PrxDy58-xCo42 (x = 0, 15, 30, 45, and 58 at%) alloys were designed to increase the coercivity while reducing the Dy consumption. The results indicate that when the Pr content in the diffusion source reached 45 %, coercivity increased significantly from 13.87 kOe to 21.76 kOe. In addition, the thermal stability and Curie temperature of the magnet were improved considerably. The increase in Pr content also led to a significant increase in the grain boundary phases of the diffused magnets. This is attributed to the introduction of Pr, which facilitates the formation of grain boundary phases and enhances demagnetization coupling between the main phases. The Pr45Dy13Co42 alloy investigated in this study provides novel insights into the potential design of diffusion sources.
{"title":"NdFeB coercivity enhancement and temperature coefficient reduction by Pr-Dy-Co diffusion","authors":"Kehan Ren , Qing Li , Shuai Cao , Xiangming Lu , Jiateng Zhang , Shengzhi Dong , Shuai Guo , Renjie Chen , Aru Yan","doi":"10.1016/j.jmmm.2025.172856","DOIUrl":"10.1016/j.jmmm.2025.172856","url":null,"abstract":"<div><div>Grain boundary diffusion is utilized to enhance magnetic properties by modulating the organizational structure of the magnet surface layer and optimizing the grain boundary structure. In this study, diffusion sources of Pr<em><sub>x</sub></em>Dy<sub>58-</sub><em><sub>x</sub></em>Co<sub>42</sub> (<em>x</em> = 0, 15, 30, 45, and 58 at%) alloys were designed to increase the coercivity while reducing the Dy consumption. The results indicate that when the Pr content in the diffusion source reached 45 %, coercivity increased significantly from 13.87 kOe to 21.76 kOe. In addition, the thermal stability and Curie temperature of the magnet were improved considerably. The increase in Pr content also led to a significant increase in the grain boundary phases of the diffused magnets. This is attributed to the introduction of Pr, which facilitates the formation of grain boundary phases and enhances demagnetization coupling between the main phases. The Pr<sub>45</sub>Dy<sub>13</sub>Co<sub>42</sub> alloy investigated in this study provides novel insights into the potential design of diffusion sources.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172856"},"PeriodicalIF":2.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143445945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-14DOI: 10.1016/j.jmmm.2025.172858
Qaisar Khan , Mostafa R. Abukhadra , Ahmed M. El-Sherbeeny , Jeong Ryeol Choi , Asghar Ali , Majid Khan
Sensitivity of surface plasmon polaritons (SPPs) resonance sensing is coherently controlled and modified at the dielectric medium and graphene interface under the cross Kerr nonlinear fluctuation of the dielectric function. The useful control over the sensitivity of the SPPs by control and Kerr fields is reported. The angular interrogation of sensitivity of the SPPs under the Kerr nonlinearity effect is written as . The sensitivity of the SPPs depends on the driving fields parameters such as control and probe fields detuning and control field Rabi frequency as well as decay rate. The sensitivity is a function of probe field detuning, the maximum value of sensitivity of the SPPs is reported to be 3000 deg/RIU with probe field detuning. Whereas the minimum sensitivity is investigated to be 400 deg/RIU with probe fields detunings. The reported results in this manuscript is useful applications in data storage, solar cell, sensor devices and plasmonster technology.
{"title":"Coherent manipulation of the surface plasmon resonance sensing at the dielectric-graphene interface under Cross-Kerr nonlinearity effect","authors":"Qaisar Khan , Mostafa R. Abukhadra , Ahmed M. El-Sherbeeny , Jeong Ryeol Choi , Asghar Ali , Majid Khan","doi":"10.1016/j.jmmm.2025.172858","DOIUrl":"10.1016/j.jmmm.2025.172858","url":null,"abstract":"<div><div>Sensitivity of surface plasmon polaritons (SPPs) resonance sensing is coherently controlled and modified at the dielectric medium and graphene interface under the cross Kerr nonlinear fluctuation of the dielectric function. The useful control over the sensitivity of the SPPs by control and Kerr fields is reported. The angular interrogation of sensitivity of the SPPs under the Kerr nonlinearity effect is written as <span><math><mrow><mi>d</mi><mi>θ</mi><mo>/</mo><mi>d</mi><msubsup><mrow><mi>n</mi></mrow><mrow><mi>d</mi></mrow><mrow><mi>k</mi></mrow></msubsup></mrow></math></span>. The sensitivity of the SPPs depends on the driving fields parameters such as control and probe fields detuning and control field Rabi frequency as well as decay rate. The sensitivity is a function of probe field detuning, the maximum value of sensitivity of the SPPs is reported to be 3000 deg/RIU with probe field detuning. Whereas the minimum sensitivity is investigated to be 400 deg/RIU with probe fields detunings. The reported results in this manuscript is useful applications in data storage, solar cell, sensor devices and plasmonster technology.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172858"},"PeriodicalIF":2.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-14DOI: 10.1016/j.jmmm.2025.172886
Ravindra G. Bhardwaj , Anand Katailiha , Paul C. Lou , W.P. Beyermann , Sandeep Kumar
The flexoelectronic effect leads to charge carrier transfer between two dissimilar materials, a combination of metal and doped semiconductor, when they are brought into contact under an applied strain gradient. The flexoelectronic effect may lead to continuity of electronic wavefunction and order parameter across the interface, which is called as flexoelectronic proximity effect. This study experimentally demonstrates flexoelectronic proximity effect induced canted magnetic moment in the doped p-Si thin film from ferromagnetic permalloy thin film, which give rise to RKKY interlayer exchange interaction between permalloy and p-Si layers. The canted magnetic moment manifests topological spin-Seebeck effect response in magneto-thermoelectric measurements. The topological spin-Seebeck effect is likely to arise due to inverse spin-Hall effect from topological spin texture; possibly a three-dimensional analogue of the hexagonally warped helical spin texture. This work demonstrates that thermal modulation of strain gradient can be used to tune RKKY interlayer exchange interaction between Py and p-Si from ferromagnetic to antiferromagnetic as well as magnitude of the canted magnetic moment. The canted magnetic moment and topological spin texture behavior can also be controlled by varying the thickness of the p-Si layer. The flexoelectronic proximity effect and topological spin texture can enable Si based spin, magnetic, topological and quantum applications.
{"title":"Canted magnetism and topological spin texture induced in silicon from flexoelectronic proximity effect","authors":"Ravindra G. Bhardwaj , Anand Katailiha , Paul C. Lou , W.P. Beyermann , Sandeep Kumar","doi":"10.1016/j.jmmm.2025.172886","DOIUrl":"10.1016/j.jmmm.2025.172886","url":null,"abstract":"<div><div>The flexoelectronic effect leads to charge carrier transfer between two dissimilar materials, a combination of metal and doped semiconductor, when they are brought into contact under an applied strain gradient. The flexoelectronic effect may lead to continuity of electronic wavefunction and order parameter across the interface, which is called as flexoelectronic proximity effect. This study experimentally demonstrates flexoelectronic proximity effect induced canted magnetic moment in the doped p-Si thin film from ferromagnetic permalloy thin film, which give rise to RKKY interlayer exchange interaction between permalloy and p-Si layers. The canted magnetic moment manifests topological spin-Seebeck effect response in magneto-thermoelectric measurements. The topological spin-Seebeck effect is likely to arise due to inverse spin-Hall effect from topological spin texture; possibly a three-dimensional analogue of the hexagonally warped helical spin texture. This work demonstrates that thermal modulation of strain gradient can be used to tune RKKY interlayer exchange interaction between Py and p-Si from ferromagnetic to antiferromagnetic as well as magnitude of the canted magnetic moment. The canted magnetic moment and topological spin texture behavior can also be controlled by varying the thickness of the p-Si layer. The flexoelectronic proximity effect and topological spin texture can enable Si based spin, magnetic, topological and quantum applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172886"},"PeriodicalIF":2.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-14DOI: 10.1016/j.jmmm.2025.172887
Dmitry V. Wagner , Katerina V. Kareva , Viktor A. Zhuravlev , Tatiana A. Bugrova , Aleksandr I. Tsimmerman , Roman V. Minin
In this work, BaFe12O19 hexaferrites were synthesized by self-propagating high-temperature synthesis (SHS). The ferritization temperature of SHS products has a significant effect on the content of the target M−type phase of hexaferrites. Magnetic hysteresis loops in pulsed magnetic fields up to 26 kOe were studied. It was shown that with an increase in the ferritization temperature of hexaferrites from 1000 °C to 1200 °C, the values of the coercive force and specific saturation magnetization increase due to an increase in the M−phase content and crystallite growth. The magnetization curves for hexaferrites with a high content of the M−phase were calculated. The contribution of the paraprocess to the magnitude of the specific saturation magnetization was determined. The fields of magnetocrystalline anisotropy, the values of the effective gyromagnetic ratio and the damping factors in the Landau-Lifshitz-Gilbert equation were determined by the ferromagnetic resonance method.
{"title":"Study of the phase composition, structural and magnetic properties of M−type hexaferrites produced by self-propagation high-temperature synthesis","authors":"Dmitry V. Wagner , Katerina V. Kareva , Viktor A. Zhuravlev , Tatiana A. Bugrova , Aleksandr I. Tsimmerman , Roman V. Minin","doi":"10.1016/j.jmmm.2025.172887","DOIUrl":"10.1016/j.jmmm.2025.172887","url":null,"abstract":"<div><div>In this work, BaFe<sub>12</sub>O<sub>19</sub> hexaferrites were synthesized by self-propagating high-temperature synthesis (SHS). The ferritization temperature of SHS products has a significant effect on the content of the target M−type phase of hexaferrites. Magnetic hysteresis loops in pulsed magnetic fields up to 26 kOe were studied. It was shown that with an increase in the ferritization temperature of hexaferrites from 1000 °C to 1200 °C, the values of the coercive force and specific saturation magnetization increase due to an increase in the M−phase content and crystallite growth. The magnetization curves for hexaferrites with a high content of the M−phase were calculated. The contribution of the paraprocess to the magnitude of the specific saturation magnetization was determined. The fields of magnetocrystalline anisotropy, the values of the effective gyromagnetic ratio and the damping factors in the Landau-Lifshitz-Gilbert equation were determined by the ferromagnetic resonance method.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"618 ","pages":"Article 172887"},"PeriodicalIF":2.5,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-13DOI: 10.1016/j.jmmm.2025.172877
Shaoxing Sun , Zehua Zhang , Haoyu Jia , Limin Zheng , Changcai Chen , Xiaohua Luo , Chunsheng Fang , Shengcan Ma
Hexagonal rare-earth ferrites (h-RFeO3) is a promising multiferroic materials with strong magnetoelectric coupling effect by tuning the collective tilt of FeO5 trigonal bipyramids. However, the metastable hexagonal structure for RFeO3 bulk materials is still pain point that needs to be solved. In this work, multiferroic h-RFeO3 ceramic materials were designed and prepared by doping TmFeO3 ceramics with In, which were fabricated by using the standard solid-state sintering method. Stable h-Tm1−xInxFeO3 (x = 0.6, 0.7) ceramics crystallized into a pure hexagonal structure with the polar space group P63cm (x = 0.6) and the non-polar space group P63/mmc (x = 0.7) at room temperature. Two magnetic transitions were identified in the ceramic samples, a paramagnetic to antiferromagnetic transition (TN), and spin reorientation transition (TSR). The dielectric anomalies were observed around the spin reorientation temperature (TSR), which indicates significant magnetoelectric coupling effects in the h-Tm1−xInxFeO3 (x = 0.6, 0.7) ceramics. Furthermore, using dielectric and pyroelectric characterization techniques, dielectric peaks were observed near 280 K for the x = 0.6 sample, which should be a weak structural transition through the analysis of XRD patterns at various temperatures. The presence of stable hexagonal structure for In-doping TmFeO3 is enlightening the multiferroic materials in hexagonal ferrites.
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