IEEE Transactions on Magnetics最新文献_第2页

Non-Ohmic Behavior in [Ni80Fe20/HfO2]n Discontinuous Multilayers 非连续多层[Ni80Fe20/HfO2]的非欧姆行为

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-06-26 DOI: 10.1109/TMAG.2026.3707577

Oleksandr Pylypenko;Iryna Pazukha;Andrii Lohvynov;Kostayntyn Tyschenko;Yurii Shkurdoda;Serhii Vorobiov;Vladimir Tkáč;Vladimir Komanický

{"title":"Non-Ohmic Behavior in [Ni80Fe20/HfO2]n Discontinuous Multilayers","authors":"Oleksandr Pylypenko;Iryna Pazukha;Andrii Lohvynov;Kostayntyn Tyschenko;Yurii Shkurdoda;Serhii Vorobiov;Vladimir Tkáč;Vladimir Komanický","doi":"10.1109/TMAG.2026.3707577","DOIUrl":"https://doi.org/10.1109/TMAG.2026.3707577","url":null,"abstract":"In this research, the crystal structure and electron transport properties of [Ni80<inline-formula> <tex-math>${mathrm {Fe}}_{20}(d)$ </tex-math></inline-formula>/HfO2(3)]10/S discontinuous multilayers were studied. As a preparation method, the sequential magnetron sputtering was chosen. It was demonstrated that the microstructure of the thin-film samples consists of ferromagnetic nanoparticles embedded within an amorphous HfO2 matrix. For [Ni80<inline-formula> <tex-math>$mathrm{Fe}_{20}(d)$ </tex-math></inline-formula>/HfO2(3)]10/S discontinuous multilayers with an effective thickness of ferromagnetic layers <inline-formula> <tex-math>$d = 1$ </tex-math></inline-formula>–3 nm, the mechanism of variable-range hopping conduction, in which electrons make thermally activated flips between localized states in the insulator matrix, is dominant. It has been established that size dependences of resistivity <inline-formula> <tex-math>$rho (d)$ </tex-math></inline-formula> and temperature coefficient of resistance (TCR) <inline-formula> <tex-math>$beta (d)$ </tex-math></inline-formula> are monotonous. The resistivity value decreases, and the TCR value increases with the growth of the effective thickness of Ni80Fe20 layers. It was demonstrated that the interval of effective thicknesses of Ni80Fe20 layers can be divided into three parts: <inline-formula> <tex-math>$d le 3$ </tex-math></inline-formula> nm (with insulator regime of conductivity), <inline-formula> <tex-math>$d gt 4$ </tex-math></inline-formula> nm (with metal regime of conductivity), and 3 nm <inline-formula> <tex-math>$lt ~d le 4$ </tex-math></inline-formula> nm (with transition regime of conductivity).","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"62 8","pages":"2001604-2001604"},"PeriodicalIF":1.9,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148628065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IEEE Transactions on Magnetics Institutional Listings 《IEEE磁学汇刊》

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-07-28 DOI: 10.1109/TMAG.2026.3715002

引用次数: 0

Impedance Modeling and Sensitivity Analysis of Fully Differential Inductive Displacement Sensor 全差分电感式位移传感器的阻抗建模与灵敏度分析

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-06-03 DOI: 10.1109/TMAG.2026.3699928

Jinghua Hu;Changlong Li;Zhenzhong Su;Jie Xu;Shibo Dong;Dong Wang;Wei Zhu

{"title":"Impedance Modeling and Sensitivity Analysis of Fully Differential Inductive Displacement Sensor","authors":"Jinghua Hu;Changlong Li;Zhenzhong Su;Jie Xu;Shibo Dong;Dong Wang;Wei Zhu","doi":"10.1109/TMAG.2026.3699928","DOIUrl":"https://doi.org/10.1109/TMAG.2026.3699928","url":null,"abstract":"Inductive displacement sensors are widely used in magnetic bearing control systems due to their simple structure, easy integration, and high cost-effectiveness. The frequency at which the sensor operates is above a few kilohertz, so non-ideal factors such as iron core reluctance and eddy-current effects cannot be ignored. However, existing studies do not fully consider non-ideal factors, which limits the accuracy of the sensor impedance model. In this article, the Schwarz–Christoffel transformation is used to compensate for stator-pole fringing effects, complex permeability is introduced to account for eddy-current and hysteresis effects, and a leakage coefficient is adopted to model flux leakage. An improved sensor impedance model and output characteristic model were established. An experimental platform is built to validate the proposed modeling method. The results show that the prediction error of sensitivity does not exceed 4% at different frequencies, verifying the correctness of the model. In addition, this article proposes a highly sensitive radial and axial integrated full-bridge inductive displacement sensor, which has higher anti-interference ability and output sensitivity compared to the traditional half-bridge differential circuit structure. Meanwhile, a quadrature phase-locked demodulation circuit based on analog switches has been developed, which has high excitation frequency capability and low cost.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"62 8","pages":"4000710-4000710"},"PeriodicalIF":1.9,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148627055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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IEEE Transactions on Magnetics Publication Information IEEE电磁学学报出版信息

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-07-28 DOI: 10.1109/TMAG.2026.3715001

引用次数: 0

Unified Harmonic-Based Modeling of Overhang Effects in Rotating Electrical Machines 基于统一谐波的旋转电机悬垂效应建模

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-06-22 DOI: 10.1109/TMAG.2026.3706220

Mircea Popescu;Matthew Leak

引用次数: 0

An Enhanced Inductance Calculation Model for Molded Inductors Using the Energy Method 一种基于能量法的增强型电感计算模型

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-06-17 DOI: 10.1109/TMAG.2026.3704461

Jiaquan Liu;Zhuo Zhu;Jiaxin Gao;Zimo Xing;Tao Wang;Xian Wang;Yan Nie

{"title":"An Enhanced Inductance Calculation Model for Molded Inductors Using the Energy Method","authors":"Jiaquan Liu;Zhuo Zhu;Jiaxin Gao;Zimo Xing;Tao Wang;Xian Wang;Yan Nie","doi":"10.1109/TMAG.2026.3704461","DOIUrl":"https://doi.org/10.1109/TMAG.2026.3704461","url":null,"abstract":"Molded inductors, recognized for their compact structure, excellent magnetic shielding, and superior DC bias characteristics, are extensively employed in the miniaturization of power inductor designs. However, conventional simulation approaches fail to satisfy the dual demands of high accuracy and high efficiency required for automated design. While finite element methods (FEMs) offer high precision, they are computationally intensive; similarly, equivalent magnetic circuit (EMC) methods are efficient but suffer from limited accuracy. This article presents an enhanced EMC model based on the energy method, tailored for single-layer solenoid-type round wire wound integrated molded inductors. By establishing an analytical model for corner magnetic fields and integrating the energy method for accurate reluctance computation, the proposed model achieves a significant improvement in calculation precision. Experimental validation on three inductors with different structural parameters demonstrates that the prediction error of the model remains within 10%, while the computational speed is three orders of magnitude faster than that of finite element analysis. The model exhibits significant practical applicability in engineering and offers valuable insights for inductor design.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"62 8","pages":"8400309-8400309"},"PeriodicalIF":1.9,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148627794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IEEE Magnetics Society Information IEEE磁学学会信息

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-07-28 DOI: 10.1109/TMAG.2026.3715000

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Fundamental Limits of Vector Recording for High-Density Heat-Assisted Magnetic Recording 高密度热辅助磁记录中矢量记录的基本限制

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-08-01 Epub Date: 2026-06-22 DOI: 10.1109/TMAG.2026.3706055

Kamal Hosen;R. H. Victora

{"title":"Fundamental Limits of Vector Recording for High-Density Heat-Assisted Magnetic Recording","authors":"Kamal Hosen;R. H. Victora","doi":"10.1109/TMAG.2026.3706055","DOIUrl":"https://doi.org/10.1109/TMAG.2026.3706055","url":null,"abstract":"The rapid growth of global data driven by AI-based computing is accelerating innovation in hard disk drive (HDD) technologies, where heat-assisted magnetic recording (HAMR) and vector recording are emerging as critical solutions for next-generation high-density storage. This work presents a comprehensive analysis of the fundamental limits of vector recording in HAMR by incorporating thermally induced reader magnetization fluctuations, inter-track interference, write synchronization, and crosstalk into a unified modeling framework. Reader magnetic noise is modeled via the Landau–Lifshitz–Gilbert (LLG) equation and shown to impose a 1–1.5 dB SNR loss across reader designs. A direct comparison with two-dimensional magnetic recording (TDMR) demonstrates that vector recording achieves an approximately 3 dB higher peak SNR without requiring aggressive reader size scaling. Analysis of down-track transition offsets reveals that synchronization and transition curvature critically govern signal superposition and crosstalk behavior at the inter-track boundary (ITB) region. The results establish that vector recording preserves signal integrity while relaxing aggressive reader scaling, highlighting its robustness and scalability for next-generation high-areal-density HAMR systems.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"62 8","pages":"3001208-3001208"},"PeriodicalIF":1.9,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148627010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Data-Driven Parameter-Topology Hybrid Optimization of Permanent Magnet Motors Based on Deep Reinforcement Learning 基于深度强化学习的数据驱动永磁电机参数-拓扑混合优化

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-07-01 Epub Date: 2025-12-01 DOI: 10.1109/TMAG.2025.3639044

Takahiro Sato

{"title":"A Data-Driven Parameter-Topology Hybrid Optimization of Permanent Magnet Motors Based on Deep Reinforcement Learning","authors":"Takahiro Sato","doi":"10.1109/TMAG.2025.3639044","DOIUrl":"10.1109/TMAG.2025.3639044","url":null,"abstract":"Parameter-topology hybrid optimization is one of the effective approaches to simultaneous optimizations of the shapes of magnets and magnetic cores of an interior permanent magnet synchronous motor (IPMSM). However, because the magnet and topology parameters are related to each other, their simultaneous optimizations result in a difficult optimization problem. This article presents a data-driven parameter-topology hybrid optimization for IPMSM based on deep reinforcement learning (RL). The design process of IPMSM is newly formulated as a stochastic process, in which the magnet and topology parameters are assumed to be generated probabilistically in order, depending on the design requirement. The present method estimates these probability density functions through a modified actor-critic-based RL by utilizing rotor geometry data, which are generated using evolutionary algorithms. Numerical results show that the present RL can obtain rotor shapes depending on the requirement through optimizations and learning. It is also shown that the trained actor model can be used as a generative model for the rotor shape, that is, the trained actor model can generate various rotor shapes depending on the input requirement, through which the actor model can also be refined.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"62 7","pages":"8101706-8101706"},"PeriodicalIF":1.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148442993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Topology Optimization With Arbitrarily Many Materials: Density Versus Level Set Applied to a Hybrid Excited Rotor 任意多材料拓扑优化：密度与水平集在混合激励转子中的应用

IF 1.9 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2026-07-01 Epub Date: 2025-11-07 DOI: 10.1109/TMAG.2025.3630504

Théodore Cherrière;Peter Gangl;Nepomuk Krenn

引用次数: 0