Pub Date : 2025-12-03DOI: 10.1109/LMAG.2025.3639932
Ly Phi Cuong;Binh Duy Le;Jong-Oh Park;Kim Tien Nguyen;Byungjeon Kang;Jayoung Kim
The rising burden of kidney stone disease worldwide highlights the need for more efficient debris clearance strategy in a single session with low complication and less pain. This letter presents a development of a flexible magnetic catheter for urinary stone removal, offering a highly flexible tip with a large working channel and magnetic maneuverability for deep penetration of the catheter into minor calyces. A flexible magnetic catheter is constructed from multiple polymer materials and multiple magnetic rings. A model-based optimization algorithm is developed to determine the optimal design parameters of the catheter, ensuring high bending angle and reasonable stiffness for insertion and stone debris suction. The catheter performances are validated through finite-element simulation comparison and human-sized phantom model experiments, demonstrating superior control performance and its potential of a single-session catheter for urinary stone removal application.
{"title":"Development of a Flexible Magnetic Catheter for Urinary Stone Removal","authors":"Ly Phi Cuong;Binh Duy Le;Jong-Oh Park;Kim Tien Nguyen;Byungjeon Kang;Jayoung Kim","doi":"10.1109/LMAG.2025.3639932","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3639932","url":null,"abstract":"The rising burden of kidney stone disease worldwide highlights the need for more efficient debris clearance strategy in a single session with low complication and less pain. This letter presents a development of a flexible magnetic catheter for urinary stone removal, offering a highly flexible tip with a large working channel and magnetic maneuverability for deep penetration of the catheter into minor calyces. A flexible magnetic catheter is constructed from multiple polymer materials and multiple magnetic rings. A model-based optimization algorithm is developed to determine the optimal design parameters of the catheter, ensuring high bending angle and reasonable stiffness for insertion and stone debris suction. The catheter performances are validated through finite-element simulation comparison and human-sized phantom model experiments, demonstrating superior control performance and its potential of a single-session catheter for urinary stone removal application.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11274412","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145929435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-30DOI: 10.1109/LMAG.2025.3627471
Alexander Chizhik;Valentina Zhukova;Arcady Zhukov
The formation and transformation of the surface magnetic structure induced by the longitudinal and transverse stresses in magnetic microwires have been studied by the magneto-optical Kerr effect. Circular, elliptical, and longitudinal magnetic domains are the main types of the observed structures. Because of transverse distribution of the internal stress, there exists a significant difference in magnetic behavior inside the microwires. This difference influences the domain nucleation and domain wall motion.
{"title":"Magnetic Structures in Amorphous Glass-Coated Microwires Induced by Longitudinal and Transverse Stresses","authors":"Alexander Chizhik;Valentina Zhukova;Arcady Zhukov","doi":"10.1109/LMAG.2025.3627471","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3627471","url":null,"abstract":"The formation and transformation of the surface magnetic structure induced by the longitudinal and transverse stresses in magnetic microwires have been studied by the magneto-optical Kerr effect. Circular, elliptical, and longitudinal magnetic domains are the main types of the observed structures. Because of transverse distribution of the internal stress, there exists a significant difference in magnetic behavior inside the microwires. This difference influences the domain nucleation and domain wall motion.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145612135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-10-30DOI: 10.1109/LMAG.2025.3627467
Elyssa D. DeVisscher;Anna E. Mays;Xin Fan
The flip-chip ferromagnetic resonance spectrum with a coplanar waveguide has been widely used for studying magnetization dynamics of thin films. Typically, the peak position and linewidth are extrapolated, while the line shape—specifically how far the spectrum deviates from a perfectly symmetric Lorentzian—is neglected. To quantify this deviation, we define a deviation phase angle (DPA), and we find that the DPA of the ferromagnetic resonance spectrum depends on frequency, impedance mismatch in the transmission line, and the material itself.
{"title":"Understanding the Line Shape of Ferromagnetic Resonance Spectrum in a Flip-Chip Measurement","authors":"Elyssa D. DeVisscher;Anna E. Mays;Xin Fan","doi":"10.1109/LMAG.2025.3627467","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3627467","url":null,"abstract":"The flip-chip ferromagnetic resonance spectrum with a coplanar waveguide has been widely used for studying magnetization dynamics of thin films. Typically, the peak position and linewidth are extrapolated, while the line shape—specifically how far the spectrum deviates from a perfectly symmetric Lorentzian—is neglected. To quantify this deviation, we define a deviation phase angle (DPA), and we find that the DPA of the ferromagnetic resonance spectrum depends on frequency, impedance mismatch in the transmission line, and the material itself.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-09-10DOI: 10.1109/LMAG.2025.3608663
Yijia Liu;R. H. Victora
In this letter, the effectiveness of a novel three-layer thermally exchanged coupled composite media (3ly-ECC) design is evaluated in enhancing magnetic recording performance, particularly, in mitigating adjacent track erasure (ATE). The performance of the proposed 3ly-ECCs is compared against the two-layer (2ly) counterparts at both high peak temperature (850 K) and reduced peak temperature (650 K). It is found that incorporating a high saturation magnetization in the top layer and a high anisotropy in the middle layer within the 3ly configurations yields a 15% reduction in ATE and a 0.6 dB gain in signal-to-noise ratio (SNR), at the expense of a tolerable 5% increase in transition jitter relative to the 2ly structures. These findings highlight, that with a high thermal gradient during the writing process, the combination of high-Ku and high-Ms media designs effectively suppresses thermally induced remanent noise, therefore, improving stability against off-track thermal perturbation. Nonetheless, the performance gains in ATE and SNR come with the acceptable tradeoff of transitijon jitter loss, which is a compromise that may be justified in high-density recording applications where minimizing intertrack interference is critical.
{"title":"Evaluation of Adjacent Track Erasure for Thermal Exchange Coupled Composite Media","authors":"Yijia Liu;R. H. Victora","doi":"10.1109/LMAG.2025.3608663","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3608663","url":null,"abstract":"In this letter, the effectiveness of a novel three-layer thermally exchanged coupled composite media (3ly-ECC) design is evaluated in enhancing magnetic recording performance, particularly, in mitigating adjacent track erasure (ATE). The performance of the proposed 3ly-ECCs is compared against the two-layer (2ly) counterparts at both high peak temperature (850 K) and reduced peak temperature (650 K). It is found that incorporating a high saturation magnetization in the top layer and a high anisotropy in the middle layer within the 3ly configurations yields a 15% reduction in ATE and a 0.6 dB gain in signal-to-noise ratio (SNR), at the expense of a tolerable 5% increase in transition jitter relative to the 2ly structures. These findings highlight, that with a high thermal gradient during the writing process, the combination of high-Ku and high-Ms media designs effectively suppresses thermally induced remanent noise, therefore, improving stability against off-track thermal perturbation. Nonetheless, the performance gains in ATE and SNR come with the acceptable tradeoff of transitijon jitter loss, which is a compromise that may be justified in high-density recording applications where minimizing intertrack interference is critical.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145255897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study presents the synthesis of W-type hexagonal ferrite (BaZn$_{2}$Fe$_{16}$O$_{27}$) using a powder metallurgy approach to enhance magnetic properties through controlled Ca doping. By identifying the crystalline phase and repeating to adjust the composition, we achieved a primary-phase W-type hexaferrite substituted with about Ba: Ca = 0.5: 0.5 in the chemical formula. Electron probe microanalysis results helped us reach the sample with Ba: Ca: Zn: Fe = 0.52: 0.48: 0.78: 10.73, demonstrating the highest magnetization of 131.0 A$cdot$ m$^{2}$/kg at 1.8 K. Our findings suggest the magnetically optimal nature of this composition for Ca-substituted Ba-based W-type ferrite. This investigation contributes to understanding Ba-Ca-based W-type hexaferrite and provides a foundation for future exploration and optimization of its magnetic properties.
采用粉末冶金的方法，通过可控的Ca掺杂，合成了w型六方铁氧体（BaZn$_{2}$Fe$_{16}$O$_{27}$）。通过鉴定晶相，反复调整组成，得到了化学式中Ba: Ca = 0.5: 0.5左右取代的初生相w型六铁素体。电子探针微量分析结果表明，样品Ba: Ca: Zn: Fe = 0.52: 0.48: 0.78: 10.73，在1.8 K下磁化强度最高，为131.0 A$cdot$ m$^{2}$/kg。我们的研究结果表明，这种成分对ca取代ba基w型铁氧体具有最佳的磁性。该研究有助于进一步了解ba - ca基w型六铁氧体，为进一步探索和优化其磁性能提供基础。
{"title":"Exploration of Synthesis Conditions for High-Magnetization Ba-Ca-Based W-Type Hexaferrites","authors":"Matsui Yosuke;Watanabe Kowashi;Kakizaki Koichi;Kamishima Kenji","doi":"10.1109/LMAG.2025.3599741","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3599741","url":null,"abstract":"This study presents the synthesis of W-type hexagonal ferrite (BaZn<inline-formula><tex-math>$_{2}$</tex-math></inline-formula>Fe<inline-formula><tex-math>$_{16}$</tex-math></inline-formula>O<inline-formula><tex-math>$_{27}$</tex-math></inline-formula>) using a powder metallurgy approach to enhance magnetic properties through controlled Ca doping. By identifying the crystalline phase and repeating to adjust the composition, we achieved a primary-phase W-type hexaferrite substituted with about Ba: Ca = 0.5: 0.5 in the chemical formula. Electron probe microanalysis results helped us reach the sample with Ba: Ca: Zn: Fe = 0.52: 0.48: 0.78: 10.73, demonstrating the highest magnetization of 131.0 A<inline-formula><tex-math>$cdot$</tex-math></inline-formula> m<inline-formula><tex-math>$^{2}$</tex-math></inline-formula>/kg at 1.8 K. Our findings suggest the magnetically optimal nature of this composition for Ca-substituted Ba-based W-type ferrite. This investigation contributes to understanding Ba-Ca-based W-type hexaferrite and provides a foundation for future exploration and optimization of its magnetic properties.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145036958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study developed a protein detection method of the growth differentiation factor-15 (GDF15) using a ultrabroadband microstrip line type probe up to 67 GHz. We prepared samples that bound the GDF15 and magnetic nanoparticles (MNPs) using primary and secondary antibodies. High-density secondary MNPs reacted with antigen several times to enhance the magnetic signal using a biotin–avidin reaction on a cover glass. The reaction between the antigen and the MNPs was confirmed by fluorescent particles and a vibrating sample magnetometer. The application of the dc field enhanced sharp ferromagnetic resonance (FMR), improving the signal-to-noise ratio for GDF15 detection. The difference in FMR intensity between 1.5 and 2 T increased clearly with increasing GDF15 concentration (0, 0.01, 0.1, and 1 µg/ml). A reproducible calibration curve was obtained for protein (GDF15) detection. Our method shows promise for sensitive and quantitative protein detection in biomedical applications.
{"title":"Detection of GDF15 Protein Using Ultrabroadband Ferromagnetic Resonance of Magnetic Nanoparticles","authors":"Shin Yabukami;Ryoya Masui;Toru Murayama;Junichi Honda;Loi Tonthat;Kazuhiko Okita;Akihiro Kuwahata;Takaaki Abe","doi":"10.1109/LMAG.2025.3592474","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3592474","url":null,"abstract":"This study developed a protein detection method of the growth differentiation factor-15 (GDF15) using a ultrabroadband microstrip line type probe up to 67 GHz. We prepared samples that bound the GDF15 and magnetic nanoparticles (MNPs) using primary and secondary antibodies. High-density secondary MNPs reacted with antigen several times to enhance the magnetic signal using a biotin–avidin reaction on a cover glass. The reaction between the antigen and the MNPs was confirmed by fluorescent particles and a vibrating sample magnetometer. The application of the dc field enhanced sharp ferromagnetic resonance (FMR), improving the signal-to-noise ratio for GDF15 detection. The difference in FMR intensity between 1.5 and 2 T increased clearly with increasing GDF15 concentration (0, 0.01, 0.1, and 1 µg/ml). A reproducible calibration curve was obtained for protein (GDF15) detection. Our method shows promise for sensitive and quantitative protein detection in biomedical applications.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-07-18DOI: 10.1109/LMAG.2025.3590624
Hiroaki Kikuchi
Enhancing the control of magnetic anisotropy is key to boosting the performance of thin-film magnetic devices. We developed a simple and efficient method that combines Joule heating with a magnetic field, offering an alternative to conventional static magnetic field annealing, which typically requires complex setups, such as heaters, vacuum systems, and generating strong magnetic field with higher power consumption. Our results demonstrate that this method can be applied to thin-film magnetoimpedance elements in air within a very short time, without degrading their performance. The study also explores additional topics, including localized control, reversibility, a range of applicable materials, and the potential limitations of the approach.
{"title":"Simple and Rapid Controlling Method of Magnetic Anisotropy and Its Application to Thin-Film Magnetoimpedance Elements","authors":"Hiroaki Kikuchi","doi":"10.1109/LMAG.2025.3590624","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3590624","url":null,"abstract":"Enhancing the control of magnetic anisotropy is key to boosting the performance of thin-film magnetic devices. We developed a simple and efficient method that combines Joule heating with a magnetic field, offering an alternative to conventional static magnetic field annealing, which typically requires complex setups, such as heaters, vacuum systems, and generating strong magnetic field with higher power consumption. Our results demonstrate that this method can be applied to thin-film magnetoimpedance elements in air within a very short time, without degrading their performance. The study also explores additional topics, including localized control, reversibility, a range of applicable materials, and the potential limitations of the approach.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-06-06DOI: 10.1109/LMAG.2025.3577475
Steven Louis;Hannah Bradley;Artem Litvinenko;Vasyl Tyberkevych
This work presents an equivalent circuit model for magnetic tunnel junctions (MTJs) that accurately reproduces their magnetization dynamics and electrical behavior within the macrospin approximation. The model is validated through direct numerical simulations of the Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation, encompassing ferromagnetic resonance, field- and spin-torque-induced switching and spin-torque-induced oscillations. Simulation results exhibit excellent agreement between the equivalent circuit model and the LLGS-based simulations, confirming the model accuracy and utility for efficient circuit-level analysis of MTJs. The capability of handling time-dependent magnetic fields and voltage-driven excitations renders the model applicable to diverse areas, including neuromorphic computing, microwave signal processing, and spintronic memory technologies. By providing a computationally efficient yet physically rigorous circuit representation, this work facilitates seamless integration of MTJs into complex electronic systems, thereby accelerating the advancement of novel spintronic circuit architectures.
{"title":"A Physics-Based Circuit Model for Magnetic Tunnel Junctions","authors":"Steven Louis;Hannah Bradley;Artem Litvinenko;Vasyl Tyberkevych","doi":"10.1109/LMAG.2025.3577475","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3577475","url":null,"abstract":"This work presents an equivalent circuit model for magnetic tunnel junctions (MTJs) that accurately reproduces their magnetization dynamics and electrical behavior within the macrospin approximation. The model is validated through direct numerical simulations of the Landau–Lifshitz–Gilbert–Slonczewski (LLGS) equation, encompassing ferromagnetic resonance, field- and spin-torque-induced switching and spin-torque-induced oscillations. Simulation results exhibit excellent agreement between the equivalent circuit model and the LLGS-based simulations, confirming the model accuracy and utility for efficient circuit-level analysis of MTJs. The capability of handling time-dependent magnetic fields and voltage-driven excitations renders the model applicable to diverse areas, including neuromorphic computing, microwave signal processing, and spintronic memory technologies. By providing a computationally efficient yet physically rigorous circuit representation, this work facilitates seamless integration of MTJs into complex electronic systems, thereby accelerating the advancement of novel spintronic circuit architectures.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144641078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-06-06DOI: 10.1109/LMAG.2025.3577473
Ryan W. Greening;Elyssa D. DeVisscher;Xin Fan
The magneto-optical Kerr effect (MOKE) is a convenient technique to study the magnetization of thin films. However, both polar and longitudinal MOKE responses contribute to the total Kerr response in a typical longitudinal MOKE measurement. Here, we present a simple optical technique to suppress the polar MOKE response in the oblique angle incidence by exploiting differences between polar and longitudinal MOKE responses upon double reflection from the sample. By using a mirror to reflect the beam and by selectively using a quarter-wave plate, the polar or longitudinal MOKE signals can be suppressed and, therefore, studied separately using the same oblique experimental setup. To demonstrate the feasibility of this technique, we use an out-of-plane magnetized Pt/Co/Pt film and a Pt/Co/Cu/NiFe heterostructure with both in-plane and out-of-plane magnetization. We show that the polar MOKE of the CoPt film can be suppressed by a factor of 6 compared to a conventional MOKE measurement. By accounting for birefringence, we further reduce the polar MOKE response in a longitudinal MOKE measurement of the Pt/Co/Cu/NiFe film by over 160 times compared to a conventional oblique-angle MOKE measurement.
{"title":"Method to Suppress Polar Kerr Signal in a Longitudinal Magneto-Optic Kerr Effect Measurement","authors":"Ryan W. Greening;Elyssa D. DeVisscher;Xin Fan","doi":"10.1109/LMAG.2025.3577473","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3577473","url":null,"abstract":"The magneto-optical Kerr effect (MOKE) is a convenient technique to study the magnetization of thin films. However, both polar and longitudinal MOKE responses contribute to the total Kerr response in a typical longitudinal MOKE measurement. Here, we present a simple optical technique to suppress the polar MOKE response in the oblique angle incidence by exploiting differences between polar and longitudinal MOKE responses upon double reflection from the sample. By using a mirror to reflect the beam and by selectively using a quarter-wave plate, the polar or longitudinal MOKE signals can be suppressed and, therefore, studied separately using the same oblique experimental setup. To demonstrate the feasibility of this technique, we use an out-of-plane magnetized Pt/Co/Pt film and a Pt/Co/Cu/NiFe heterostructure with both in-plane and out-of-plane magnetization. We show that the polar MOKE of the CoPt film can be suppressed by a factor of 6 compared to a conventional MOKE measurement. By accounting for birefringence, we further reduce the polar MOKE response in a longitudinal MOKE measurement of the Pt/Co/Cu/NiFe film by over 160 times compared to a conventional oblique-angle MOKE measurement.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-04-28DOI: 10.1109/LMAG.2025.3564795
Aarzoo Dhull;Prashant Kumar;Vipul Sharma;Pawan S. Rana;Bijoy K. Kuanr
In the present investigation, we report the growth of off-stoichiometric Ni-based Heusler thin films of different thicknesses (6–30 nm) on a Si (100) substrate by radio frequency sputtering at 300 °C. We have used an indigenously prepared target comprising thin sheets of Ni, Fe, and Al in specific proportions. Of all the Heusler alloys, Ni2FeAl is the least researched alloy that may offer immense possibilities in developing spin-based devices. The Ni55Fe14Al31 films crystallize into the A2 phase as confirmed by the diffraction pattern. With the increase in the thickness of films, surface roughness improves followed by an increase in saturation magnetization (MS). Further, we have explored the effect of Ta buffer on the static and dynamic magnetic behavior of films and compared it with unbuffered films. The Ta buffer layer significantly impacts the surface morphology of the films. The in-plane magnetic hysteresis loops indicate higher MS with Ta buffer. Dynamic magnetization is probed via ferromagnetic resonance technique over a broad band of microwave frequencies and has been quantified in terms of Gilbert damping constant (α). The Ta buffer reduces the Gilbert damping constant from 10.1 × 10−3 to 8.4 × 10−3 in 30 nm thick films.
{"title":"Effects of Ta Buffer Layer on Structural and Magnetic Properties of Sputtered Ni2FeAl","authors":"Aarzoo Dhull;Prashant Kumar;Vipul Sharma;Pawan S. Rana;Bijoy K. Kuanr","doi":"10.1109/LMAG.2025.3564795","DOIUrl":"https://doi.org/10.1109/LMAG.2025.3564795","url":null,"abstract":"In the present investigation, we report the growth of off-stoichiometric Ni-based Heusler thin films of different thicknesses (6–30 nm) on a Si (100) substrate by radio frequency sputtering at 300 °C. We have used an indigenously prepared target comprising thin sheets of Ni, Fe, and Al in specific proportions. Of all the Heusler alloys, Ni<sub>2</sub>FeAl is the least researched alloy that may offer immense possibilities in developing spin-based devices. The Ni<sub>55</sub>Fe<sub>14</sub>Al<sub>31</sub> films crystallize into the A2 phase as confirmed by the diffraction pattern. With the increase in the thickness of films, surface roughness improves followed by an increase in saturation magnetization (<italic>M</i><sub>S</sub>). Further, we have explored the effect of Ta buffer on the static and dynamic magnetic behavior of films and compared it with unbuffered films. The Ta buffer layer significantly impacts the surface morphology of the films. The in-plane magnetic hysteresis loops indicate higher <italic>M</i><sub>S</sub> with Ta buffer. Dynamic magnetization is probed via ferromagnetic resonance technique over a broad band of microwave frequencies and has been quantified in terms of Gilbert damping constant (α). The Ta buffer reduces the Gilbert damping constant from 10.1 × 10<sup>−3</sup> to 8.4 × 10<sup>−3</sup> in 30 nm thick films.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"16 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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