IEEE Magnetics Letters最新文献

2025 Index IEEE Magnetics Letters Vol. 16 2025索引IEEE Magnetics Letters Vol. 16

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-02-24 DOI: 10.1109/LMAG.2026.3665103

引用次数: 0

Novel Transcranial Magnetic Stimulation Coil for Precise Deep Brain Location Stimulation 用于精确脑深部定位刺激的新型经颅磁刺激线圈

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-02-11 DOI: 10.1109/LMAG.2026.3663877

Zihan Tang;Tao Zhang;Shuang Zhang

引用次数: 0

Study on Worst-Case Gradient Forces on Untethered Magnetic Devices Using Two Synchronized Rotating Magnetic Dipoles 利用两个同步旋转磁偶极子研究非系绳磁性器件的最坏情况梯度力

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-23 DOI: 10.1109/LMAG.2026.3657287

Zhengya Zhang;Bohuan Lin;Anke Klingner;Guang Feng;Yanfei Liao;Jian Guo;Wei Xue;Fengping Li;Wujun Geng;Sarthak Misra;Islam S.M.Khalil

{"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}

引用次数: 0

Self-Cooling Multiferroic Magnetic Devices 自冷多铁磁器件

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-23 DOI: 10.1109/LMAG.2026.3657139

Kristen Booth;Aqarib Hussain;Jacob L. Jones;Todd C. Monson

引用次数: 0

Asymmetric Write Error Rate Caused by Self-Heating-Induced Offset Field Shift in Spin-Orbit-Torque Magnetic Tunnel Junctions 自旋-轨道-转矩磁隧道结中自热诱导偏置场位移引起的非对称写错误率

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-12 DOI: 10.1109/LMAG.2026.3652528

Kaiyuan Zhou;Wenlong Yang;Xuejie Xie;Hengan Zhou;Cheng Zhuo;Enlong Liu

{"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}

引用次数: 0

Magnetic Properties of Nd-Fe-B Single Dots Fabricated Using the PLD–LIFT Method 用PLD-LIFT法制备Nd-Fe-B单点的磁性能

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-12 DOI: 10.1109/LMAG.2026.3652505

K. Koike;T. Okawa;Y. Ikagawa;T. Amiya;G. Tahara;M. Itakura;T. Yasunaga;M. Nakano

{"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>Hc) was nearly independent of laser power, whereas an increased defocus rate (DF rate) enhanced <italic>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.","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}

引用次数: 0

Developing Laser-Assisted Heating Magnetization Utilizing a Distributed External Magnetic Field for Magnetic MEMS 基于分布式外磁场的磁性微机电系统激光辅助加热磁化研究

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-12 DOI: 10.1109/LMAG.2026.3652483

Keita Nagai;Tadahiko Shinshi

{"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}

引用次数: 0

Assume a Spherical Cube: Bounding the Force and Torque Induced on a Conductive Nonmagnetic Cube by a Rotating Magnetic Dipole 假设一个球面立方体：由旋转磁偶极子在导电非磁性立方体上感应的力和扭矩的边界

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-01 Epub Date: 2026-03-17 DOI: 10.1109/LMAG.2026.3674363

Travis J. Allen;Levi M. Barker;Jake J. Abbott

引用次数: 0

Comparative Interfacial Exchange Coupling in Ta/CoFeB/BiFeO3: Impact of La (A-Site) and Co (B-Site) Doping in Epitaxial Sputtered Films Ta/CoFeB/BiFeO3中界面交换耦合的比较：La （A-Site）和Co （B-Site）掺杂对外延溅射薄膜的影响

IF 1.1 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-01 Epub Date: 2026-04-20 DOI: 10.1109/LMAG.2026.3685982

Ismat Jamil;Naveen Negi;Digbijaya Palai;Bhagwati Prasad

{"title":"Comparative Interfacial Exchange Coupling in Ta/CoFeB/BiFeO3: Impact of La (A-Site) and Co (B-Site) Doping in Epitaxial Sputtered Films","authors":"Ismat Jamil;Naveen Negi;Digbijaya Palai;Bhagwati Prasad","doi":"10.1109/LMAG.2026.3685982","DOIUrl":"https://doi.org/10.1109/LMAG.2026.3685982","url":null,"abstract":"Scalable integration of multiferroics and robust magnetic control without external magnetic fields are key requirements for voltage-driven spintronic devices. Here, we demonstrate an industry-compatible approach based on radio frequency magnetron sputtering to grow single-crystalline epitaxial BiFeO3 (BFO), 10% Co B-site–doped BiFeO3 (BFCO), and 10% La A-site–doped BiFeO3 (LBFO) thin films on SrTiO3(001) and integrate them with CoFeB to form Ta/CoFeB/(BFO, BFCO, and LBFO)/STO heterostructures. Powder X-ray diffraction (XRD) confirms rhombohedral BFO-based targets, while high-resolution XRD establishes phase-pure (00ℓ)-oriented epitaxy; ω-rocking curves show full width at half maxima < 0.5° and reciprocal space mapping verifies coherent in-plane strain. Piezoresponse force microscopy confirms robust local ferroelectric switching in all films. Among the compositions, BFCO exhibits the strongest magnetic response (<italic>Ms ≈ 77 emu·cm−3 and <italic>Hc ≈ 348 Oe) and produces the largest interfacial exchange-coupling signature when coupled to CoFeB: the CoFeB coercivity increases to ∼843 Oe in Ta/CoFeB/BFCO/STO compared with ∼30 Oe for Ta/CoFeB/Si. These results establish sputtered epitaxial BFCO as a scalable platform for engineering strong interfacial pinning in multiferroic/ferromagnet stacks, enabling low-power, high-density voltage-controlled spintronic memories beyond conventional spin-transfer torque magnetoresistive random-access memory.","PeriodicalId":13040,"journal":{"name":"IEEE Magnetics Letters","volume":"17 ","pages":"4100105-4100105"},"PeriodicalIF":1.1,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148003501","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}

引用次数: 0

Two-Magnon Quantum Interference With a Temporal Beamsplitter 用时间分束器进行双磁振子量子干涉

IF 1.6 4区物理与天体物理

IEEE Magnetics Letters Pub Date : 2026-01-01 Epub Date: 2026-03-14 DOI: 10.1109/LMAG.2026.3693612

Cody A. Trevillian;Steven Louis;Hannah Bradley;Vasyl Tyberkevych

引用次数: 0