Pub Date : 2026-02-11DOI: 10.1109/LMAG.2026.3663877
Zihan Tang;Tao Zhang;Shuang Zhang
This letter presents an eccentric inverted-cone three-dimensional transcranial magnetic stimulation (TMS) coil to address the poor focusing ability and small effective stimulation depth in commercial TMS coils. The performance of the coil is compared with that of several commercial and theoretical coils via finite element modeling. Spherical head model simulations reveal that the coil outperforms existing coils in terms of focusing ability and effective stimulation depth. Furthermore, employing a dual-coil combination effectively enhances the maximum induced electric field strength and increases the focusing ability and effective stimulation depth of the signal.
{"title":"Novel Transcranial Magnetic Stimulation Coil for Precise Deep Brain Location Stimulation","authors":"Zihan Tang;Tao Zhang;Shuang Zhang","doi":"10.1109/LMAG.2026.3663877","DOIUrl":"https://doi.org/10.1109/LMAG.2026.3663877","url":null,"abstract":"This letter presents an eccentric inverted-cone three-dimensional transcranial magnetic stimulation (TMS) coil to address the poor focusing ability and small effective stimulation depth in commercial TMS coils. The performance of the coil is compared with that of several commercial and theoretical coils via finite element modeling. Spherical head model simulations reveal that the coil outperforms existing coils in terms of focusing ability and effective stimulation depth. Furthermore, employing a dual-coil combination effectively enhances the maximum induced electric field strength and increases the focusing ability and effective stimulation depth of the signal.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"17 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2026-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147440675","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}
Untethered magnetic devices (UMDs) hold significant clinical potential for removing blood clots. However, in the complex intravascular environment, their locomotion may be disturbed. Such disturbances can lead to variations in the magnetic gradient force exerted on the UMD, increasing the risk of vascular damage. Therefore, evaluating the magnetic gradient force acting on the UMD under worst-case conditions is essential for risk mitigation. In this letter, we a novel method to estimate the upper and lower bounds of the worst-case magnetic gradient force acting on the UMD, with actuation provided by two synchronized rotating magnetic dipoles. To assess the robustness of the algorithm, we conducted a Monte Carlo simulation in which the dipole directions of the two synchronized rotating magnetic dipoles and the dipole direction of the UMD were randomly varied 1 000 000 times in the three-dimensional space to simulate all possible scenarios that may be encountered by the UMD in intravascular environments. The simulation results indicate that the worst-case magnetic gradient force remains below the upper bound predicted by the algorithm, thereby validating its effectiveness.
{"title":"Study on Worst-Case Gradient Forces on Untethered Magnetic Devices Using Two Synchronized Rotating Magnetic Dipoles","authors":"Zhengya Zhang;Bohuan Lin;Anke Klingner;Guang Feng;Yanfei Liao;Jian Guo;Wei Xue;Fengping Li;Wujun Geng;Sarthak Misra;Islam S.M.Khalil","doi":"10.1109/LMAG.2026.3657287","DOIUrl":"https://doi.org/10.1109/LMAG.2026.3657287","url":null,"abstract":"Untethered magnetic devices (UMDs) hold significant clinical potential for removing blood clots. However, in the complex intravascular environment, their locomotion may be disturbed. Such disturbances can lead to variations in the magnetic gradient force exerted on the UMD, increasing the risk of vascular damage. Therefore, evaluating the magnetic gradient force acting on the UMD under worst-case conditions is essential for risk mitigation. In this letter, we a novel method to estimate the upper and lower bounds of the worst-case magnetic gradient force acting on the UMD, with actuation provided by two synchronized rotating magnetic dipoles. To assess the robustness of the algorithm, we conducted a Monte Carlo simulation in which the dipole directions of the two synchronized rotating magnetic dipoles and the dipole direction of the UMD were randomly varied 1 000 000 times in the three-dimensional space to simulate all possible scenarios that may be encountered by the UMD in intravascular environments. The simulation results indicate that the worst-case magnetic gradient force remains below the upper bound predicted by the algorithm, thereby validating its effectiveness.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"17 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146223702","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 : 2026-01-23DOI: 10.1109/LMAG.2026.3657139
Kristen Booth;Aqarib Hussain;Jacob L. Jones;Todd C. Monson
Increasing switching frequency reduces magnetic volume, but conventional ferrites, used from tens to hundreds of kilohertz, cannot sustain the temperature and frequency ranges demanded by current and emerging wide bandgap and ultrawide bandgap devices. This work presents a novel magnetic material architecture combining nanocrystalline magnetic material and multiferroic layers for megahertz power conversion. The high saturation flux density of nanocrystalline alloys supports miniaturization but is traditionally constrained by excessive losses above 10 kHz. A revolutionary multiferroic material with solid-state cooling via caloric materials is defined that will enable the next generation of magnetic devices for wide-bandgap-integrated designs. This letter highlights the fundamental physics behind this capability alongside early development of a finite element analysis for the multiferroic-based magnetic device using ANSYS, showing that the core achieves more uniform thermal distribution and reduces peak temperature by 9 $^{circ }$C compared to conventional ferrites.
{"title":"Self-Cooling Multiferroic Magnetic Devices","authors":"Kristen Booth;Aqarib Hussain;Jacob L. Jones;Todd C. Monson","doi":"10.1109/LMAG.2026.3657139","DOIUrl":"https://doi.org/10.1109/LMAG.2026.3657139","url":null,"abstract":"Increasing switching frequency reduces magnetic volume, but conventional ferrites, used from tens to hundreds of kilohertz, cannot sustain the temperature and frequency ranges demanded by current and emerging wide bandgap and ultrawide bandgap devices. This work presents a novel magnetic material architecture combining nanocrystalline magnetic material and multiferroic layers for megahertz power conversion. The high saturation flux density of nanocrystalline alloys supports miniaturization but is traditionally constrained by excessive losses above 10 kHz. A revolutionary multiferroic material with solid-state cooling via caloric materials is defined that will enable the next generation of magnetic devices for wide-bandgap-integrated designs. This letter highlights the fundamental physics behind this capability alongside early development of a finite element analysis for the multiferroic-based magnetic device using ANSYS, showing that the core achieves more uniform thermal distribution and reduces peak temperature by 9 <inline-formula><tex-math>$^{circ }$</tex-math></inline-formula>C compared to conventional ferrites.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"17 ","pages":"1-4"},"PeriodicalIF":1.1,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147299719","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 : 2026-01-12DOI: 10.1109/LMAG.2026.3652528
Kaiyuan Zhou;Wenlong Yang;Xuejie Xie;Hengan Zhou;Cheng Zhuo;Enlong Liu
In this letter, we study the asymmetric increase of write error rate (WER) as the write voltage is elevated in spin-orbit-torque (SOT) magnetic tunnel junctions (MTJs) with perpendicular magnetic anisotropy. Besides the decrease of the free layer’s (FL) coercive field rendering the FL more vulnerable to the influence of offset field from synthetic antiferromagnets (SAFs), we observe, that during the write process, the temperature rise caused by the self-heating effect also modifies the magnetic properties of SAF layers in MTJ stacks. Through the measurement and analysis of two device types with different SAF designs, the amplitude and direction of the offset field show different temperature dependence, which determines an opposite preferentially stable state for the FL, and hence the anomalously high WER. Macrospin simulations of WER incorporating self-heating effect and temperature-dependent magnetic properties in both FL and SAF reproduce well the experimental observations. These findings offer novel insights into the role of the offset field and its temperature dependence in optimizing WER performance in SOT-MTJ devices.
{"title":"Asymmetric Write Error Rate Caused by Self-Heating-Induced Offset Field Shift in Spin-Orbit-Torque Magnetic Tunnel Junctions","authors":"Kaiyuan Zhou;Wenlong Yang;Xuejie Xie;Hengan Zhou;Cheng Zhuo;Enlong Liu","doi":"10.1109/LMAG.2026.3652528","DOIUrl":"https://doi.org/10.1109/LMAG.2026.3652528","url":null,"abstract":"In this letter, we study the asymmetric increase of write error rate (WER) as the write voltage is elevated in spin-orbit-torque (SOT) magnetic tunnel junctions (MTJs) with perpendicular magnetic anisotropy. Besides the decrease of the free layer’s (FL) coercive field rendering the FL more vulnerable to the influence of offset field from synthetic antiferromagnets (SAFs), we observe, that during the write process, the temperature rise caused by the self-heating effect also modifies the magnetic properties of SAF layers in MTJ stacks. Through the measurement and analysis of two device types with different SAF designs, the amplitude and direction of the offset field show different temperature dependence, which determines an opposite preferentially stable state for the FL, and hence the anomalously high WER. Macrospin simulations of WER incorporating self-heating effect and temperature-dependent magnetic properties in both FL and SAF reproduce well the experimental observations. These findings offer novel insights into the role of the offset field and its temperature dependence in optimizing WER performance in SOT-MTJ devices.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"17 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146139120","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 : 2026-01-12DOI: 10.1109/LMAG.2026.3652505
K. Koike;T. Okawa;Y. Ikagawa;T. Amiya;G. Tahara;M. Itakura;T. Yasunaga;M. Nakano
Single-dot Nd-Fe-B micromagnets were fabricated using the pulsed laser deposition-laser-induced forward transfer (PLD–LIFT) technique, and their magnetic properties were systematically examined. Hysteresis measurements with a vibrating sample magneto meter revealed that the coercivity (Hc) was nearly independent of laser power, whereas an increased defocus rate (DF rate) enhanced Hc up to 340 kA/m. Scanning electron microscopy and cross-sectional scanning transmission electron microscopy analyses revealed that each dot comprises grains ranging from submicrometer to micrometer scale. Within these grains, an Nd2Fe14B core is encapsulated by an Fe-rich matrix containing dispersed Nd oxides. The thickness of this Fe-rich outer shell modifies the exchange pathway at the Nd2Fe14B/Fe interface, giving rise to the characteristic two-step demagnetization. Guided by these observations, a simplified Nd2Fe14B/α-Fe core–shell model was developed and evaluated through micromagnetic simulations, which successfully reproduced the stepwise reversal and clarified DF’s role in suppressing soft-phase connectivity and improving loop squareness. Collectively, these findings identify DF rate as the dominant processing parameter and provide practical guidelines for tailoring PLD–LIFT Nd-Fe-B micromagnets toward microelectromechanical systems applications.
{"title":"Magnetic Properties of Nd-Fe-B Single Dots Fabricated Using the PLD–LIFT Method","authors":"K. Koike;T. Okawa;Y. Ikagawa;T. Amiya;G. Tahara;M. Itakura;T. Yasunaga;M. Nakano","doi":"10.1109/LMAG.2026.3652505","DOIUrl":"https://doi.org/10.1109/LMAG.2026.3652505","url":null,"abstract":"Single-dot Nd-Fe-B micromagnets were fabricated using the pulsed laser deposition-laser-induced forward transfer (PLD–LIFT) technique, and their magnetic properties were systematically examined. Hysteresis measurements with a vibrating sample magneto meter revealed that the coercivity (<italic>H</i><sub>c</sub>) was nearly independent of laser power, whereas an increased defocus rate (DF rate) enhanced <italic>H</i><sub>c</sub> up to 340 kA/m. Scanning electron microscopy and cross-sectional scanning transmission electron microscopy analyses revealed that each dot comprises grains ranging from submicrometer to micrometer scale. Within these grains, an Nd<sub>2</sub>Fe<sub>14</sub>B core is encapsulated by an Fe-rich matrix containing dispersed Nd oxides. The thickness of this Fe-rich outer shell modifies the exchange pathway at the Nd<sub>2</sub>Fe<sub>14</sub>B/Fe interface, giving rise to the characteristic two-step demagnetization. Guided by these observations, a simplified Nd<sub>2</sub>Fe<sub>14</sub>B/α-Fe core–shell model was developed and evaluated through micromagnetic simulations, which successfully reproduced the stepwise reversal and clarified DF’s role in suppressing soft-phase connectivity and improving loop squareness. Collectively, these findings identify DF rate as the dominant processing parameter and provide practical guidelines for tailoring PLD–LIFT Nd-Fe-B micromagnets toward microelectromechanical systems applications.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"17 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146223734","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 : 2026-01-12DOI: 10.1109/LMAG.2026.3652483
Keita Nagai;Tadahiko Shinshi
Self-demagnetizing fields in uniformly magnetized flat magnets limit the surface magnetic flux density and output power of magnetic microelectromechanical systems (MEMSs). In laser-assisted heating magnetization (LAHM), the laser locally reduces the coercivity, and a uniform reverse magnetic field subsequently reverses the magnetization. LAHM was developed to produce fine multipole patterns and address these performance limitations. This study extends LAHM by superimposing a distributed external magnetic field tailored to the target pattern. The field is generated by a prepatterned multipole master NdFeB magnet ($B_{r}$ = 1.30 T and $H_{cj}$ = 2388 kA/m) placed on a uniform reverse-field source, which strengthens the local magnetizing field in the target areas and attenuates it elsewhere. Experiments employing 0.3 mm thick NdFeB samples demonstrate that distributed-field LAHM increases the magnetization ratio by 10.8% and the peak-to-peak surface magnetic flux density by 54.2 mT compared with conventional uniform-field LAHM. These results indicate a potential route to higher performance multipole magnets for MEMS applications.
{"title":"Developing Laser-Assisted Heating Magnetization Utilizing a Distributed External Magnetic Field for Magnetic MEMS","authors":"Keita Nagai;Tadahiko Shinshi","doi":"10.1109/LMAG.2026.3652483","DOIUrl":"https://doi.org/10.1109/LMAG.2026.3652483","url":null,"abstract":"Self-demagnetizing fields in uniformly magnetized flat magnets limit the surface magnetic flux density and output power of magnetic microelectromechanical systems (MEMSs). In laser-assisted heating magnetization (LAHM), the laser locally reduces the coercivity, and a uniform reverse magnetic field subsequently reverses the magnetization. LAHM was developed to produce fine multipole patterns and address these performance limitations. This study extends LAHM by superimposing a distributed external magnetic field tailored to the target pattern. The field is generated by a prepatterned multipole master NdFeB magnet (<inline-formula><tex-math>$B_{r}$</tex-math></inline-formula> = 1.30 T and <inline-formula><tex-math>$H_{cj}$</tex-math></inline-formula> = 2388 kA/m) placed on a uniform reverse-field source, which strengthens the local magnetizing field in the target areas and attenuates it elsewhere. Experiments employing 0.3 mm thick NdFeB samples demonstrate that distributed-field LAHM increases the magnetization ratio by 10.8% and the peak-to-peak surface magnetic flux density by 54.2 mT compared with conventional uniform-field LAHM. These results indicate a potential route to higher performance multipole magnets for MEMS applications.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"17 ","pages":"1-5"},"PeriodicalIF":1.1,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146175752","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 : 2025-12-03DOI: 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}
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