Pub Date : 2025-03-15DOI: 10.1016/j.jmmm.2025.172982
Sinan Zhang , Tong Gao , Xi Chu , Chuanfang Chen
Tumors pose a serious threat to human health and have long been the center of attention in the medical field. In addition to conventional tumor treatment modalities, nano-therapy for tumors has been particularly developed. The magneto-mechanical force in tumor treatment has gradually attracted people’s attention. The mechanical force generated by magnetic nanoparticles under the magnetic field can damage tumor cells. This method is precise and non-invasive. It can also be combined with other methods to boost the effectiveness of tumor treatment further. This work reviews the reports of the application of mechanical force generated by magnetic nanoparticles under the magnetic field in tumor treatment, and the prospects are prospected.
{"title":"Application of mechanical force generated by magnetic nanoparticles under magnetic field in tumor treatment","authors":"Sinan Zhang , Tong Gao , Xi Chu , Chuanfang Chen","doi":"10.1016/j.jmmm.2025.172982","DOIUrl":"10.1016/j.jmmm.2025.172982","url":null,"abstract":"<div><div>Tumors pose a serious threat to human health and have long been the center of attention in the medical field. In addition to conventional tumor treatment modalities, nano-therapy for tumors has been particularly developed. The magneto-mechanical force in tumor treatment has gradually attracted people’s attention. The mechanical force generated by magnetic nanoparticles under the magnetic field can damage tumor cells. This method is precise and non-invasive. It can also be combined with other methods to boost the effectiveness of tumor treatment further. This work reviews the reports of the application of mechanical force generated by magnetic nanoparticles under the magnetic field in tumor treatment, and the prospects are prospected.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172982"},"PeriodicalIF":2.5,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643578","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 : 2025-03-14DOI: 10.1016/j.jmmm.2025.172958
O.A. Kosmachev, Yu. A. Fridman, E.A. Yarygina
The possibility of an orientational phase transition along a magnetic field, with the formation of an “angular” nematic phase with a nonzero average magnetic moment, in an anisotropic magnet with a large biquadratic exchange interaction and the spin of a magnetic ion S = 1 is investigated. The transformation of the geometric image of a spin nematic depending on the magnitude of the magnetic field is investigated. A phase diagram of the system is constructed.
{"title":"Orientational phase transition by magnetic field in anisotropic non-heisenberg magnet with S = 1","authors":"O.A. Kosmachev, Yu. A. Fridman, E.A. Yarygina","doi":"10.1016/j.jmmm.2025.172958","DOIUrl":"10.1016/j.jmmm.2025.172958","url":null,"abstract":"<div><div>The possibility of an orientational phase transition along a magnetic field, with the formation of an “angular” nematic phase with a nonzero average magnetic moment, in an anisotropic magnet with a large biquadratic exchange interaction and the spin of a magnetic ion S = 1 is investigated. The transformation of the geometric image of a spin nematic depending on the magnitude of the magnetic field is investigated. A phase diagram of the system is constructed.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172958"},"PeriodicalIF":2.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684862","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 : 2025-03-14DOI: 10.1016/j.jmmm.2025.172939
Eduardo Saavedra , Piero Terruzzi , Juan Luis Palma , Juan Escrig
Through numerical simulations, we investigate the equilibrium states and dynamic responses of stadium-shaped and elliptical nanodots in the absence of a bias field. Our findings reveal two distinct equilibrium states – single domain and vortex – identified in these nanodots. Notably, the resonant frequencies and the number of peaks in the dynamics response are shown to be influenced by the minimum energy configuration, which is intricately linked to the system’s aspect ratio. The insights gained from this exploration contribute to a deeper understanding of the interplay between geometric parameters and dynamic behavior in low-dimensional magnetic nanostructures, offering valuable considerations for the design and optimization of on-chip microwave devices in spintronics and magnonics applications.
{"title":"Interplay between geometry and spin dynamics in elongated magnetic nanoislands: Elliptical vs stadium-shaped cases","authors":"Eduardo Saavedra , Piero Terruzzi , Juan Luis Palma , Juan Escrig","doi":"10.1016/j.jmmm.2025.172939","DOIUrl":"10.1016/j.jmmm.2025.172939","url":null,"abstract":"<div><div>Through numerical simulations, we investigate the equilibrium states and dynamic responses of stadium-shaped and elliptical nanodots in the absence of a bias field. Our findings reveal two distinct equilibrium states – single domain and vortex – identified in these nanodots. Notably, the resonant frequencies and the number of peaks in the dynamics response are shown to be influenced by the minimum energy configuration, which is intricately linked to the system’s aspect ratio. The insights gained from this exploration contribute to a deeper understanding of the interplay between geometric parameters and dynamic behavior in low-dimensional magnetic nanostructures, offering valuable considerations for the design and optimization of on-chip microwave devices in spintronics and magnonics applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172939"},"PeriodicalIF":2.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632162","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 : 2025-03-14DOI: 10.1016/j.jmmm.2025.172938
S.M. Bakharev, M.A. Borich, S.P. Savchenko
The dependencies of the caustic patterns of magnetoelastic waves on the direction of the magnetic field in Fe82Ga18 crystals are investigated. The phenomenological approach is used. The long-wavelength approximation is assumed in this approach. The energy of the system is made up of three terms: elastic, magnetic, and magnetoelastic. The caustic patterns are calculated for the diagonal plane of the crystal.
{"title":"Magnetoelastic wave caustic pattern dependency on direction of magnetic field in Fe82Ga18 crystals","authors":"S.M. Bakharev, M.A. Borich, S.P. Savchenko","doi":"10.1016/j.jmmm.2025.172938","DOIUrl":"10.1016/j.jmmm.2025.172938","url":null,"abstract":"<div><div>The dependencies of the caustic patterns of magnetoelastic waves on the direction of the magnetic field in Fe<sub>82</sub>Ga<sub>18</sub> crystals are investigated. The phenomenological approach is used. The long-wavelength approximation is assumed in this approach. The energy of the system is made up of three terms: elastic, magnetic, and magnetoelastic. The caustic patterns are calculated for the diagonal plane of the crystal.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172938"},"PeriodicalIF":2.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643576","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 : 2025-03-14DOI: 10.1016/j.jmmm.2025.172969
Bo Meng, Ou Man Lin, Hongyun Zhang
In this work, we investigated the stability, electronic structures, and magnetic properties of a 2D pentagonal iron phosphide (penta-FeP2) through density functional theory (DFT) calculations. The predicted penta-FeP2 is an FM semiconductor with thermal, dynamical, and mechanical stability, and narrow direct band gap of 0.916 eV. The estimated TC surpasses 705 K, which is sufficiently higher than room temperature. The MAE is as high as 358 μeV/Fe, which enhances the FM stability of the penta-FeP2. In addition, the 2D material also exhibits ultrahigh mobility for both holes and electrons. The light electron mobility is up to 21, 992 cm2 V−1 s−1, while the light hole mobility is 2, 890 cm2 V−1 s−1. It also exhibits isotropic visible light absorption and a low lattice thermal conductivity of ∼20 W m−1 K−1 at room temperature. The 2D FeP2 displays a number of desirable properties, including excellent stability, high TC, large MAE, high carrier mobility, and a direct band gap. These characteristics make it a promising candidate for spintronic devices.
{"title":"Two-dimensional ferromagnetic penta-FeP2 with high Curie temperature and carrier mobility","authors":"Bo Meng, Ou Man Lin, Hongyun Zhang","doi":"10.1016/j.jmmm.2025.172969","DOIUrl":"10.1016/j.jmmm.2025.172969","url":null,"abstract":"<div><div>In this work, we investigated the stability, electronic structures, and magnetic properties of a 2D pentagonal iron phosphide (penta-FeP<sub>2</sub>) through density functional theory (DFT) calculations. The predicted penta-FeP<sub>2</sub> is an FM semiconductor with thermal, dynamical, and mechanical stability, and narrow direct band gap of 0.916 eV. The estimated T<sub>C</sub> surpasses 705 K, which is sufficiently higher than room temperature. The MAE is as high as 358 μeV/Fe, which enhances the FM stability of the penta-FeP<sub>2</sub>. In addition, the 2D material also exhibits ultrahigh mobility for both holes and electrons. The light electron mobility is up to 21, 992 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>, while the light hole mobility is 2, 890 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>. It also exhibits isotropic visible light absorption and a low lattice thermal conductivity of ∼20 W m<sup>−1</sup> K<sup>−1</sup> at room temperature. The 2D FeP<sub>2</sub> displays a number of desirable properties, including excellent stability, high T<sub>C</sub>, large MAE, high carrier mobility, and a direct band gap. These characteristics make it a promising candidate for spintronic devices.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172969"},"PeriodicalIF":2.5,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143643575","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 : 2025-03-13DOI: 10.1016/j.jmmm.2025.172955
Yu-ting Zhang , Zhen-chun Wang
Modeling the electromagnetic rail launch is a critical aspect that provides solid theoretical support for the design and optimization of launch systems. This paper comprehensively considers factors such as armature shape, rail shape, and the skin effect of current to establish a dynamic electromagnetic field model for an H-shaped armature in electromagnetic rail launch. To achieve efficient solutions, an adaptive recursive numerical analysis method is proposed. This method recursively segments the integration intervals of various variables and employs adaptive Simpson’s numerical integration for regression once the integration nodes are determined. This successfully enables the rapid resolution of the dynamic electromagnetic field model, yielding a time-varying inductance gradient. Subsequently, the Runge-Kutta method is used to calculate the velocity and displacement curves of the armature. Experimental validation of the model indicates a 2.28% error in the calculated muzzle velocity of the armature and a maximum error of 4.48% during the launch process. These results strongly validate the proposed model and the adaptive recursive numerical analysis method, providing strong evidence for theoretical analysis in electromagnetic launch technology.
{"title":"Analysis of transient electromagnetic fields in electromagnetic rail launcher using an adaptive recursive algorithm","authors":"Yu-ting Zhang , Zhen-chun Wang","doi":"10.1016/j.jmmm.2025.172955","DOIUrl":"10.1016/j.jmmm.2025.172955","url":null,"abstract":"<div><div>Modeling the electromagnetic rail launch is a critical aspect that provides solid theoretical support for the design and optimization of launch systems. This paper comprehensively considers factors such as armature shape, rail shape, and the skin effect of current to establish a dynamic electromagnetic field model for an H-shaped armature in electromagnetic rail launch. To achieve efficient solutions, an adaptive recursive numerical analysis method is proposed. This method recursively segments the integration intervals of various variables and employs adaptive Simpson’s numerical integration for regression once the integration nodes are determined. This successfully enables the rapid resolution of the dynamic electromagnetic field model, yielding a time-varying inductance gradient. Subsequently, the Runge-Kutta method is used to calculate the velocity and displacement curves of the armature. Experimental validation of the model indicates a 2.28% error in the calculated muzzle velocity of the armature and a maximum error of 4.48% during the launch process. These results strongly validate the proposed model and the adaptive recursive numerical analysis method, providing strong evidence for theoretical analysis in electromagnetic launch technology.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172955"},"PeriodicalIF":2.5,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684864","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 : 2025-03-12DOI: 10.1016/j.jmmm.2025.172947
L. Péter , L.F. Kiss, I. Bakonyi
It was observed in recent magnetoresistance studies on elongated strip-shaped thin foil samples that the MR(H) hysteresis curves have different shapes and widths in the longitudinal (L) configuration (field H parallel with the measuring current) and in the transverse (T) configuration (field H transverse to the measuring current). Subsequent magnetic measurements [L.F. Kiss et al., Eur. Phys. J Plus139, 844 (2024)] of similar strip-shaped samples taken with different field orientations (corresponding either to the LMR or TMR configurations of the magnetoresistance measurements) revealed differences also in the M(H) magnetization curves, which are attributed to demagnetizing effects. After correcting for the demagnetizing field, the transverse M(H) curves could be brought in fairly good overlap with the measured longitudinal M(H) curves. In the present work, results of MR(H) measurements are reported on strips of the same Ni-Co alloys and pure Ni metal which were used in the M(H) study. Based on this recent work on the M(H) curves, one can now explain the differences in the shape and width of the LMR(H) and TMR(H) curves of a given material in a fully quantitative manner by taking into account the demagnetizing effects. Similarly to the transverse M(H) curves, the TMR(H) curves could also be corrected for the demagnetizing field, yielding good agreement with the LMR(H) curves. Furthermore, whereas the LMR(H) curves exhibited a normal hysteresis corresponding to the hysteresis behavior of the M(H) curve, the TMR(H) curves showed an anomalous behavior which can also be ascribed to demagnetizing effects. The same holds true also for the polar magnetoresistance curves PMR(H) measured in a magnetic field perpendicular to the strip plane.
{"title":"Influence of demagnetizing effect on the shape and broadening of magnetoresistance curves","authors":"L. Péter , L.F. Kiss, I. Bakonyi","doi":"10.1016/j.jmmm.2025.172947","DOIUrl":"10.1016/j.jmmm.2025.172947","url":null,"abstract":"<div><div>It was observed in recent magnetoresistance studies on elongated strip-shaped thin foil samples that the MR(<em>H</em>) hysteresis curves have different shapes and widths in the longitudinal (L) configuration (field <em>H</em> parallel with the measuring current) and in the transverse (T) configuration (field <em>H</em> transverse to the measuring current). Subsequent magnetic measurements [L.F. Kiss et al., <em>Eur. Phys. J Plus</em> <strong>139</strong>, 844 (2024)] of similar strip-shaped samples taken with different field orientations (corresponding either to the LMR or TMR configurations of the magnetoresistance measurements) revealed differences also in the <em>M</em>(<em>H</em>) magnetization curves, which are attributed to demagnetizing effects. After correcting for the demagnetizing field, the transverse <em>M</em>(<em>H</em>) curves could be brought in fairly good overlap with the measured longitudinal <em>M</em>(<em>H</em>) curves. In the present work, results of MR(<em>H</em>) measurements are reported on strips of the same Ni-Co alloys and pure Ni metal which were used in the <em>M</em>(<em>H</em>) study. Based on this recent work on the <em>M</em>(<em>H</em>) curves, one can now explain the differences in the shape and width of the LMR(<em>H</em>) and TMR(<em>H</em>) curves of a given material in a fully quantitative manner by taking into account the demagnetizing effects. Similarly to the transverse <em>M</em>(<em>H</em>) curves, the TMR(<em>H</em>) curves could also be corrected for the demagnetizing field, yielding good agreement with the LMR(<em>H</em>) curves. Furthermore, whereas the LMR(<em>H</em>) curves exhibited a normal hysteresis corresponding to the hysteresis behavior of the <em>M</em>(<em>H</em>) curve, the TMR(<em>H</em>) curves showed an anomalous behavior which can also be ascribed to demagnetizing effects. The same holds true also for the polar magnetoresistance curves PMR(<em>H</em>) measured in a magnetic field perpendicular to the strip plane.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172947"},"PeriodicalIF":2.5,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The monoisotopic impurity ions of 53Cr in a single crystal of yttrium orthosilicate (Y2SiO5) have been studied by the electron paramagnetic resonance (EPR). Several X-band EPR spin transitions of the chromium ion (S = 3/2) were recorded in magnetic fields up to 1.7 T. The chromium ion exhibited a substantial fine structure of spin sublevels, with two doublets split by 53 GHz. As a consequence of the high anisotropy of the zero-field interactions, the resonance conditions of the EPR transitions are strongly dependent on the direction of the external magnetic field relative to the crystallographic axes. In some orientations, the nonlinear dependence of the spin sublevels on the magnetic field leads to the formation of an anticrossing between spin states with projections and . In addition to this well established anticrossing region, a new region formed by the states with projections and has been identified. It appears near the upper limit of the EPR spectrometer (1.7 T), where the core of the spectrometer magnet approaches saturation. The EPR spectra of the scandium endofullerene Sc2@C80(CH2Ph) are taken as a standard to calibrate the magnetic field in this regime. This procedure enables a more accurate determination of the fine structure of the chromium ion. The values D = 25.07 GHz and E = 5.29 GHz are derived by comparing calibrated experimental data with numerical simulations.
{"title":"A new anticrossing region of monoisotopic impurity 53Cr ions in Y2SiO5","authors":"R.B. Zaripov, I.T. Khairutdinov, V.F. Tarasov, Yu.E. Kandrashkin","doi":"10.1016/j.jmmm.2025.172956","DOIUrl":"10.1016/j.jmmm.2025.172956","url":null,"abstract":"<div><div>The monoisotopic impurity ions of <sup>53</sup>Cr in a single crystal of yttrium orthosilicate (Y<sub>2</sub>SiO<sub>5</sub>) have been studied by the electron paramagnetic resonance (EPR). Several X-band EPR spin transitions of the chromium ion (S = 3/2) were recorded in magnetic fields up to 1.7 T. The chromium ion exhibited a substantial fine structure of spin sublevels, with two doublets split by 53 GHz. As a consequence of the high anisotropy of the zero-field interactions, the resonance conditions of the EPR transitions are strongly dependent on the direction of the external magnetic field relative to the crystallographic axes. In some orientations, the nonlinear dependence of the spin sublevels on the magnetic field leads to the formation of an anticrossing between spin states with projections <span><math><mrow><msub><mi>m</mi><mi>S</mi></msub><mo>=</mo><mo>+</mo><mn>1</mn><mo>/</mo><mn>2</mn></mrow></math></span> and <span><math><mrow><msub><mi>m</mi><mi>S</mi></msub><mo>=</mo><mo>-</mo><mn>3</mn><mo>/</mo><mn>2</mn></mrow></math></span>. In addition to this well established anticrossing region, a new region formed by the states with projections <span><math><mrow><msub><mi>m</mi><mi>S</mi></msub><mo>=</mo><mo>-</mo><mn>1</mn><mo>/</mo><mn>2</mn></mrow></math></span> and <span><math><mrow><msub><mi>m</mi><mi>S</mi></msub><mo>=</mo><mo>-</mo><mn>3</mn><mo>/</mo><mn>2</mn></mrow></math></span> has been identified. It appears near the upper limit of the EPR spectrometer (1.7 T), where the core of the spectrometer magnet approaches saturation. The EPR spectra of the scandium endofullerene Sc<sub>2</sub>@C<sub>80</sub>(CH<sub>2</sub>Ph) are taken as a standard to calibrate the magnetic field in this regime. This procedure enables a more accurate determination of the fine structure of the chromium ion. The values D = 25.07 GHz and E = 5.29 GHz are derived by comparing calibrated experimental data with numerical simulations.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172956"},"PeriodicalIF":2.5,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627900","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}
La-Fe-Si alloys are of high interest for near room temperature magnetocaloric applications. La1.4Fe11Co0.8Si1.2 magnetocaloric composites were prepared by hot-deformation and diffusion annealing to improve the kinetics of the formation rate of the desired 1:13 phase and reduce its brittleness. The effects of La1.4Fe11Co0.8Si1.2 particle size on the formation of 1:13 phase, as well as the magnetocaloric, mechanical and corrosion properties were investigated. The results showed that the process deployed in this work shortened the annealing time and promoted the formation of 1:13 phase. The initial particle size influenced phase formation during diffusion annealing. For smaller particle size, the 1:13 phase content and microstructural homogeneity were enhanced after annealing. The diffusion distance between the La-rich phase and the α-Fe phase decreased. Significantly, the bulk composites exhibited a large magnetic entropy change (5.6–6.1 J·kg−1·K−1, μ0ΔH = 2 T) and high refrigeration cooling power (128.7–142.1 J·kg−1) near room temperature owing to its high 1:13 phase content. These composites also had large bending strength and good corrosion resistance. Thus, this processing technology was demonstrated to be a facile method to fabricate magnetocaloric composites with excellent near room temperature performance.
{"title":"Improvement in magnetocaloric, mechanical and corrosion properties of La1.4Fe11Co0.8Si1.2 bulk composites prepared by hot-deformation and diffusion annealing","authors":"X.C. Zhong , Z.H. Liao , G.P. Li , X. Huang , J.H. Huang , C.L. Liu , Y.D. Zhang , Z.W. Liu , D.L. Jiao , W.Q. Qiu , R.V. Ramanujan","doi":"10.1016/j.jmmm.2025.172944","DOIUrl":"10.1016/j.jmmm.2025.172944","url":null,"abstract":"<div><div>La-Fe-Si alloys are of high interest for near room temperature magnetocaloric applications. La<sub>1.4</sub>Fe<sub>11</sub>Co<sub>0.8</sub>Si<sub>1.2</sub> magnetocaloric composites were prepared by hot-deformation and diffusion annealing to improve the kinetics of the formation rate of the desired 1:13 phase and reduce its brittleness. The effects of La<sub>1.4</sub>Fe<sub>11</sub>Co<sub>0.8</sub>Si<sub>1.2</sub> particle size on the formation of 1:13 phase, as well as the magnetocaloric, mechanical and corrosion properties were investigated. The results showed that the process deployed in this work shortened the annealing time and promoted the formation of 1:13 phase. The initial particle size influenced phase formation during diffusion annealing. For smaller particle size, the 1:13 phase content and microstructural homogeneity were enhanced after annealing. The diffusion distance between the La-rich phase and the α-Fe phase decreased. Significantly, the bulk composites exhibited a large magnetic entropy change (5.6–6.1 J·kg<sup>−1</sup>·K<sup>−1</sup>, <em>μ</em><sub>0</sub>Δ<em>H</em> = 2 T) and high refrigeration cooling power (128.7–142.1 J·kg<sup>−1</sup>) near room temperature owing to its high 1:13 phase content. These composites also had large bending strength and good corrosion resistance. Thus, this processing technology was demonstrated to be a facile method to fabricate magnetocaloric composites with excellent near room temperature performance.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172944"},"PeriodicalIF":2.5,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619504","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 : 2025-03-11DOI: 10.1016/j.jmmm.2025.172953
Xinyue Zhu , Xiaolong Yang , Yifan Wang , Wanhua Shi , Minmin Qiu
To study the wear mechanism of the magnetorheological brake, a set of composite disc magnetorheological brake system is proposed for easy disassembly and a brake wear mechanism experimental setup is constructed to experimentally study the effects of the number of braking times, the material of the brake disc, and the size of the magnetorheological fluid working clearance on the wear of the brake disc. The experimental results show that: with the increase of the number of braking times, the surface roughness of the brake disc gradually becomes smaller, the wear on the surface of the brake disc will worsen, and the braking torque of the magnetorheological brake will become larger. With the increase of the hardness of the brake disc, the surface wear of the brake disc will reduce accordingly. With the reduction of the magnetorheological fluid working clearance, the surface wear of the brake disc will worsen accordingly. The results of this study are of great significance for the improvement of the service life of the magnetorheological brake.
{"title":"Study on the wear mechanism of the composite disk magnetorheological brake","authors":"Xinyue Zhu , Xiaolong Yang , Yifan Wang , Wanhua Shi , Minmin Qiu","doi":"10.1016/j.jmmm.2025.172953","DOIUrl":"10.1016/j.jmmm.2025.172953","url":null,"abstract":"<div><div>To study the wear mechanism of the magnetorheological brake, a set of composite disc magnetorheological brake system is proposed for easy disassembly and a brake wear mechanism experimental setup is constructed to experimentally study the effects of the number of braking times, the material of the brake disc, and the size of the magnetorheological fluid working clearance on the wear of the brake disc. The experimental results show that: with the increase of the number of braking times, the surface roughness of the brake disc gradually becomes smaller, the wear on the surface of the brake disc will worsen, and the braking torque of the magnetorheological brake will become larger. With the increase of the hardness of the brake disc, the surface wear of the brake disc will reduce accordingly. With the reduction of the magnetorheological fluid working clearance, the surface wear of the brake disc will worsen accordingly. The results of this study are of great significance for the improvement of the service life of the magnetorheological brake.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"622 ","pages":"Article 172953"},"PeriodicalIF":2.5,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143632163","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}
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