IEEE Transactions on Magnetics最新文献_第8页

The Impact of Temperature on the Performance of an Active Terahertz-Frequency Signal Detector Based on an Antiferromagnetic Tunnel Junction 温度对基于反铁磁隧道结的有源太赫兹频率信号探测器性能的影响

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-08-07 DOI: 10.1109/TMAG.2024.3440189

Volodymyr O. Prokopenko;Elena N. Bankowski;Oleksandr V. Prokopenko;Andrei N. Slavin

{"title":"The Impact of Temperature on the Performance of an Active Terahertz-Frequency Signal Detector Based on an Antiferromagnetic Tunnel Junction","authors":"Volodymyr O. Prokopenko;Elena N. Bankowski;Oleksandr V. Prokopenko;Andrei N. Slavin","doi":"10.1109/TMAG.2024.3440189","DOIUrl":"10.1109/TMAG.2024.3440189","url":null,"abstract":"We analyze the performance of an active terahertz (THz)-frequency signal detector based on an antiferromagnetic tunnel junction (ATJ) Pt/Ir\u0000<inline-formula> <tex-math>${}_{0.2}$ </tex-math></inline-formula>\u0000 Mn\u0000<inline-formula> <tex-math>${}_{0.8}$ </tex-math></inline-formula>\u0000/MgO/Pt in a wide temperature range \u0000<inline-formula> <tex-math>$T = 4.2$ </tex-math></inline-formula>\u0000–300 K. Assuming that the geometric parameters of the ATJ depend on temperature due to the standard thermal expansion, and using usual thermal dependencies for the ATJ resistance-area product and tunneling anisotropic magnetoresistance (TAMR) ratio, we show that the output dc voltage of the detector operating in the frequency range of 0.1–1 THz increases by 50%–70% as the temperature decreases from 300 to 4.2 K. In addition, the cooling of the detector results in a substantial reduction of the low-frequency Johnson-Nyquist noise, and a corresponding increase of the detector signal-to-noise ratio (SNR) (up to 20), as well as in the reduction of the minimum detectable power of the detector (to 1 pW or less). The detector characteristics reach their optimal values near the temperature of \u0000<inline-formula> <tex-math>$T simeq 10$ </tex-math></inline-formula>\u0000 K and frequency of \u0000<inline-formula> <tex-math>$f approx 0.15$ </tex-math></inline-formula>\u0000 THz due to the interplay between the inertial properties of the detector, and its impedance-matching conditions. The developed formalism can be used for the optimization of practical parameters of ATJ-based spintronic devices.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 11","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942468","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 Stable Discontinuous Galerkin Time-Domain Method with Implicit-Explicit Time-Marching for Lossy Media 针对有损介质的含隐式-显式时间行进的稳定非连续伽勒金时域方法

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-08-07 DOI: 10.1109/tmag.2024.3439992

Ru Xiang, Xikui Ma, Liang Ma, Mingjun Chi, Jiawei Wang

引用次数: 0

Magnetic Behavior of NO Fe-Si Sheets Under Tensile and Compressive Stresses 拉伸和压缩应力下氮化铁硅片的磁性行为

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-08-07 DOI: 10.1109/TMAG.2024.3439873

Carlo Appino;Enzo Ferrara;Olivier de la Barrière;Daniele Carosi;Alessandro Morri;Alessandro Ferraiuolo;Fausto Fiorillo

{"title":"Magnetic Behavior of NO Fe-Si Sheets Under Tensile and Compressive Stresses","authors":"Carlo Appino;Enzo Ferrara;Olivier de la Barrière;Daniele Carosi;Alessandro Morri;Alessandro Ferraiuolo;Fausto Fiorillo","doi":"10.1109/TMAG.2024.3439873","DOIUrl":"10.1109/TMAG.2024.3439873","url":null,"abstract":"The stress dependence of the magnetic properties of non-oriented (NO) Fe-Si steel sheets has been investigated by measurement and analysis of hysteresis loop, magnetization curve, and energy losses taken at different peak polarization values \u0000<inline-formula> <tex-math>${J} _{p}$ </tex-math></inline-formula>\u0000 (0.5–1.5 T) between dc and \u0000<inline-formula> <tex-math>${f} =400$ </tex-math></inline-formula>\u0000 Hz. The salient feature of the material response to the stress lies in the monotonic deterioration of the soft magnetic properties, across the whole (\u0000<inline-formula> <tex-math>${J} _{p} - {f}$ </tex-math></inline-formula>\u0000) domain, on passing from the maximum tensile stress (\u0000<inline-formula> <tex-math>$sigma =+30$ </tex-math></inline-formula>\u0000 MPa) to the maximum compression (\u0000<inline-formula> <tex-math>$sigma =-30$ </tex-math></inline-formula>\u0000 MPa). This is understood in terms of stress-induced redistribution of the domains between easy axes, making magnetic hardening by compression directly related to unfavorably directed domains and 90° domain-wall-mediated magnetization transitions. The loss decomposition is carried out across the whole investigated frequency range, taking into account the skin effect at the highest frequencies. Quasi-static and dynamic losses follow similar behaviors, both monotonically increasing on passing from the tensile to the compressive stress limits, according to the theoretically expected relationship existing between the hysteresis and the excess loss components.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 10","pages":"1-13"},"PeriodicalIF":2.1,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10630555","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Design and Analysis of a High Torque Performance Dual-Side PM Vernier Motor With Synergetic Modulation Enhancement 具有协同调制增强功能的高扭矩性能双侧永磁游标电机的设计与分析

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-08-06 DOI: 10.1109/TMAG.2024.3439317

Zixuan Xiang;Suiyuan Gui;Xiaoyong Zhu;Jiaqiang Wei;Li Quan;Kunhua Chen

{"title":"Design and Analysis of a High Torque Performance Dual-Side PM Vernier Motor With Synergetic Modulation Enhancement","authors":"Zixuan Xiang;Suiyuan Gui;Xiaoyong Zhu;Jiaqiang Wei;Li Quan;Kunhua Chen","doi":"10.1109/TMAG.2024.3439317","DOIUrl":"10.1109/TMAG.2024.3439317","url":null,"abstract":"In this article, a dual-side permanent magnet vernier (DSPMV) motor is proposed for the potential application in high torque density direct drive applications, where the research efforts are focus on realizing torque performance improvement. The key of this article is to improve the airgap magnetic field by designing the synergistic modulation effect of the stator and rotor permeance. The synergetic modulation mechanism of the airgap magnetic field by the stator and rotor permeance of the DSPMV motor is analyzed. The modulation effect of the stator and rotor permeance on the dual PM magnetic field is synergistic, so as to realize the harmonics aggregation. Next, the relationship between airgap harmonics and torque performance is analyzed, and the main harmonics related to torque and torque ripple are selected. Based on this, the synergetic modulation effect on the airgap magnetic field of the motor is enhanced by optimizing the parameters related to the stator and rotor permeances, and by suppressing the harmonics that generate torque ripple and enhancing the harmonics that generate torque, the torque performance of the motor is effectively improved. Finally, the performance of the DSPMV motor is evaluated to verify the effectiveness of the design method.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 10","pages":"1-7"},"PeriodicalIF":2.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942470","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

Asymmetric Design of Consequent Pole to Reduce Torque Ripple 减少扭矩波纹的顺次极永磁同步电机非对称设计

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-08-05 DOI: 10.1109/TMAG.2024.3438372

Chaewon Jo;Inyeol Yun;Hyeonbin Hong;Ju Lee;Hyunwoo Kim

{"title":"Asymmetric Design of Consequent Pole to Reduce Torque Ripple","authors":"Chaewon Jo;Inyeol Yun;Hyeonbin Hong;Ju Lee;Hyunwoo Kim","doi":"10.1109/TMAG.2024.3438372","DOIUrl":"10.1109/TMAG.2024.3438372","url":null,"abstract":"Consequent pole permanent magnet synchronous motors (CP-PMSMs) have received attention because they can reduce the amount of permanent magnets used. Due to structural features, the magnetic flux of the air gap is imbalanced. Furthermore, torque ripple increases due to even harmonics of back electromotive force (back EMF). In this article, we propose an asymmetric design method to reduce torque ripple and magnet usage in consequent pole (CP) surface permanent magnet synchronous motor (SPMSM). First, the iron and magnet pole areas are selected asymmetrically to increase torque and reduce torque ripple. Second, the N pole of the CP-SPMSM (CP-Npole) and the S pole of the CP-SPMSM (CP-Spole) are combined in the axial direction to reduce the even harmonics of back EMF. An air gap is inserted between the two CP-SPMSMs to reduce axial leakage caused by the combination of opposing poles. Then, the location and axis length of the iron pole are designed asymmetrically. Torque ripple is further reduced by reducing the harmonics multiple of 6 of the back EMF. Finally, we compare the electromagnetic characteristics of SPMSM and CP-Npole with the proposed model. The proposed model reduces torque ripple and increases torque per permanent magnet usage. We performed the finite-element analysis in 3-D to analyze all models’ axial electromagnetic characteristics.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 10","pages":"1-5"},"PeriodicalIF":2.1,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141942471","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 Topology Optimization of Electromagnetic Devices Based on Kernel Ridge Regression as a Variant of Gaussian Network-based Shape Representation 基于核岭回归的电磁设备拓扑优化作为基于高斯网络的形状表示法的一种变体

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-08-05 DOI: 10.1109/tmag.2024.3438209

Takahiro Sato, Kota Watanabe, Hajime Igarashi

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A Design Method of Biplanar Uniform Field Coils Based on Magnetic Shielding Rooms 基于磁屏蔽室的双平面均匀磁场线圈设计方法

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-08-02 DOI: 10.1109/tmag.2024.3437773

Shuai Yuan, Minxia Shi, Leran Zhang, Jianzhi Yang, Teng Li, Yuzheng Ma

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Eddy Current Heating of Metallic Shells and Plates: Application to Gradient-Induced Conductor Heating in MRI 金属壳和金属板的涡流加热：磁共振成像中梯度诱导导体加热的应用

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-07-31 DOI: 10.1109/TMAG.2024.3432915

Seung-Kyun Lee;Matthew Tarasek;Ke Li;Dan K. Spence

{"title":"Eddy Current Heating of Metallic Shells and Plates: Application to Gradient-Induced Conductor Heating in MRI","authors":"Seung-Kyun Lee;Matthew Tarasek;Ke Li;Dan K. Spence","doi":"10.1109/TMAG.2024.3432915","DOIUrl":"10.1109/TMAG.2024.3432915","url":null,"abstract":"We consider eddy current heating of thin conductive objects that are placed in time-varying magnetic fields generated by multiple, independent field coils. This setting is particularly relevant to passive heating of metallic objects, such as radio frequency (RF) shields, in the bore of a magnetic resonance imaging (MRI) device. Previous studies have primarily focused on eddy current induced by a single driving coil or in a spatially uniform field. When multiple coils act on an object simultaneously, electric field interference needs to be properly accounted for in order to obtain accurate prediction of heating. Motivated by eddy current from MRI gradient coils, we focus on the low-frequency regime, where the conductive objects’ response is predominantly resistive. Based on the time-domain Maxwell’s equations, we derive a systematic method to calculate spatially resolved heating power density inside a conductive object. The method was tested against experimental measurement of temperature rise of stainless steel mesh in the bore of a human brain MRI scanner. The proposed method can be used to predict and mitigate heating of metallic components used in medical and scientific instruments that employ time-dependent and spatially varying magnetic fields.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 10","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141868134","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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Excess Loss Modeling in Ferromagnetic Materials, Including Thermal Effects 铁磁材料中的超额损耗建模，包括热效应

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-07-30 DOI: 10.1109/TMAG.2024.3435671

Sigrid Jacobs;Jan Rens

{"title":"Excess Loss Modeling in Ferromagnetic Materials, Including Thermal Effects","authors":"Sigrid Jacobs;Jan Rens","doi":"10.1109/TMAG.2024.3435671","DOIUrl":"10.1109/TMAG.2024.3435671","url":null,"abstract":"With traction machines operating in high-frequency conditions, the relative importance of excess loss as a core loss component has increased, requiring a higher accuracy prediction method. The impact of skin effect on the flux redistribution is integrated on the hysteresis loss, classical loss, and the excess loss. Given the fact that the flux redistribution is linked to the electrical resistivity and the permeability of the electrical steel laminations, this flux redistribution changes with the exploitation temperature of the material in the electrical machine. The proposed methodology extends the known loss models for the excess loss by using a dedicated excess loss coefficient below and above the maximum permeability of the magnetization graph to reflect the difference in skin effect behavior. While a change of temperature from 20 ° C to 200 ° C implies a resistivity change of 70%, hence the expected impact on the excess loss is 23% (according to the square root of the inverse of the resistivity), however, the excess loss changes with 70% due to the temperature effect on the skin effect. This enhanced model performance will assist machine design efficiency and, furthermore, allows for a clear link to the physical material parameters to be established.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 9","pages":"1-5"},"PeriodicalIF":2.1,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141868135","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

Simplifying Random Particle Structures Within Soft Magnetic Composite Materials for the Optimization of 3-D-FEM Simulations 简化软磁复合材料中的随机粒子结构以优化 3D-FEM 模拟

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2024-07-29 DOI: 10.1109/TMAG.2024.3434611

Tobias Stolzke;Julian Schwarz;Martin März

{"title":"Simplifying Random Particle Structures Within Soft Magnetic Composite Materials for the Optimization of 3-D-FEM Simulations","authors":"Tobias Stolzke;Julian Schwarz;Martin März","doi":"10.1109/TMAG.2024.3434611","DOIUrl":"10.1109/TMAG.2024.3434611","url":null,"abstract":"This article investigates the simulative approximation for simplifying the complex random particle arrangement within a soft magnetic composite (SMC) material by cubic atomic lattice structures. The implemented 3-D finite element model (FEM) can calculate the relative permeability of different particle arrangements in the form of a geometric replication of a volume section of the SMC material. We demonstrate the determination of the relative permeability in dependency of the volume fraction from an SMC material with the simulation, and the results are consistent with established analytical formulas, based on the demagnetization factor and relative permeability of the soft magnetic particles. The utilization of cubic atomic lattice structures is investigated in respect of reducing the computational complexity. The four atomic lattice structures introduced here each correspond to a fixed volume fraction. By varying the relative permeability of the soft magnetic particles, the simulation results reveal a maximum achievable relative permeability for the polydisperse cubic face-centered particle structure of 45.5. Furthermore, the relative permeability of several self-manufactured toroidal SMC cores with different particle size distributions was measured, and we investigated the measurement uncertainty in detail. The measurement results indicate that the particle size distribution has no influence on the relative permeability of the compound material. Especially, the simulation model of the monodisperse cubic primitive particle structure with a volume fraction of 52.36% replicates the measurement results with high conformity. In conclusion, it is possible to simplify the random particle structure in SMC materials within a specific range of volume fractions. Thereby, for volume fractions over 50%, a tradeoff between model complexity and accuracy is necessary.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 9","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141868189","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