IEEE Transactions on Magnetics最新文献_第4页

Calculation of Mutual Inductance of Two Coaxial Thick Coils With Rectangular Cross Section by Using Cylindrical Multipole Expansion

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-28 DOI: 10.1109/TMAG.2025.3535634

Filip Vučić;Davor Dobrota

{"title":"Calculation of Mutual Inductance of Two Coaxial Thick Coils With Rectangular Cross Section by Using Cylindrical Multipole Expansion","authors":"Filip Vučić;Davor Dobrota","doi":"10.1109/TMAG.2025.3535634","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3535634","url":null,"abstract":"A triple power series expansion for mutual inductance of two coaxial thick coils with rectangular cross section is obtained. Previously developed calculation methods consist of either semi-analytical methods containing numerical calculations or exact expressions containing integrals that cannot be analytically evaluated. In contrast, the triple series expansion obtained in this article is a complete and purely analytical expression—a triple power series. The triple sum contains one free parameter that is restricted by necessary and sufficient convergence conditions. To apply the method in practice, the sums are truncated, with the choice of parameter significantly impacting convergence properties and obtained precision. A theoretical analysis and empirical tests were carried out to devise a heuristic algorithm for finding a good value for the free parameter. The method’s effectiveness and very high performance were verified by comparing it to the relevant literature. Especially good results are achieved in the far-field case with sub-microsecond execution times and more than 10 significant digits of precision.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 3","pages":"1-16"},"PeriodicalIF":2.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496560","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

Modeling of Permanent Magnet Eddy-Current Coupler Based on Unsupervised Physics-Informed Radial-Based Function Neural Networks

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-16 DOI: 10.1109/TMAG.2025.3529855

Jiaxing Wang;Dazhi Wang;Sihan Wang;Wenhui Li

{"title":"Modeling of Permanent Magnet Eddy-Current Coupler Based on Unsupervised Physics-Informed Radial-Based Function Neural Networks","authors":"Jiaxing Wang;Dazhi Wang;Sihan Wang;Wenhui Li","doi":"10.1109/TMAG.2025.3529855","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3529855","url":null,"abstract":"Physics-informed neural networks (PINNs) have significant potential for modeling and parameter design in engineering field. While most existing PINNs research focuses on fluid mechanics and thermodynamics, few studies explore its application in electromagnetic field modeling of electromagnetic devices. Modeling the permanent magnet eddy-current coupler (PMECC) to predict its performance characteristics based on geometric parameters and material properties is crucial for its design and optimization. An unsupervised modeling method for PMECC based on physics-informed radial basis neural networks (PIRBFNNs) is presented in this work. The modeling and solving of static magnetic field for devices excited by permanent magnets (PMs) is realized, which solves the problem of the traditional PINN fully connected structure with many parameters and difficult training. We use the magnetic vector potential as the solution objective without providing the magnetic field boundary parameters and without labeling data, which is an unsupervised learning paradigm. The magnetic field distribution and performance of the PMECC can be computed using only the structural parameters. The experimental results show that the proposed PIRBFNN method is basically consistent with the results of the finite element numerical method and the analytical method. Additionally, a transfer learning experimental study was conducted to validate the effectiveness of the network components and training methods proposed in this article. The proposed method can, furthermore, be applied to the modeling and analysis of various devices using PM excitations.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 3","pages":"1-10"},"PeriodicalIF":2.1,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496556","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

All-Optical Switching: A Path to Recording Technology Beyond HAMR

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-16 DOI: 10.1109/TMAG.2025.3530769

Mara Strungaru;Sergiu Ruta;Richard F. L. Evans;Joseph Barker;Khanitta Yuanmae;Jessada Chureemart;Phanwadee Chureemart;Theo Rasing;Roy W. Chantrell

{"title":"All-Optical Switching: A Path to Recording Technology Beyond HAMR","authors":"Mara Strungaru;Sergiu Ruta;Richard F. L. Evans;Joseph Barker;Khanitta Yuanmae;Jessada Chureemart;Phanwadee Chureemart;Theo Rasing;Roy W. Chantrell","doi":"10.1109/TMAG.2025.3530769","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3530769","url":null,"abstract":"After 20 years of development, heat-assisted magnetic recording (HAMR) is now entering production. Given the timescale associated with HAMR development, it seems important to consider the possibilities for future replacement. HAMR is limited by the phenomenon of “backswitching” which, in the limited write fields available to the HAMR process, leads to a reduction of switching probability: a reduction which becomes more pronounced as the grain size continues to decrease. An interesting possibility for technology beyond HAMR is all-optical switching (AOS), which is a field-free option thereby removing the need for an inductively generated head field. Since the AOS is driven by exchange, the effective fields involved are extremely large and the backswitching is dramatically reduced leading to more reliable switching. We review the underlying physics of the backswitching in terms of a “quadrilemma” and show how this is overcome by AOS. We also outline recent processes designed to switch ferromagnets and the usage of combined AOS/spin torque to achieve deterministic rather than the toggle switching exhibited by ferrimagnets. The conclusion is that any materials’ design must ensure a sufficiently large effective field to overcome backswitching.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 4","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706591","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

Hybrid Modeling of Joukowsky-Barrier Synchronous Reluctance Machines

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-14 DOI: 10.1109/TMAG.2025.3529489

Mehdi Aliahmadi;Mojtaba Mirsalim;Jafar Milimonfared;Javad S. Moghani

{"title":"Hybrid Modeling of Joukowsky-Barrier Synchronous Reluctance Machines","authors":"Mehdi Aliahmadi;Mojtaba Mirsalim;Jafar Milimonfared;Javad S. Moghani","doi":"10.1109/TMAG.2025.3529489","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3529489","url":null,"abstract":"This article presents the hybrid modeling of synchronous reluctance (SynRe) machines equipped with any number of Joukowsky flux barriers (JFBs). The rotor, which includes the JFBs, the flux guides (FGs), and tangential ribs, is modeled using the magnetic equivalent circuit (MEC) method, considering the iron nonlinearity. The reluctance of the JFBs and FGs is calculated through the conformal mapping (CM) and the Joukowsky function, and the reluctance network is used for other regions, e.g., tangential rib regions that are in deep saturation under normal operating conditions. The stator slots, slot openings, and the air gap are modeled using the Fourier-based (FB) method, i.e., sub-domain technique. The stator has double-layer distributed windings, and the stator iron is assumed to be infinitely permeable. The MEC and the FB models are directly coupled by applying the coupling boundary conditions (BCs) on the rotor’s outer surface. Then, the total system of equations is solved through an iterative process. As the proposed hybrid model (HM) can be applied to SynRe machines with any number of JFBs, the results, e.g., components of the magnetic flux density, electromagnetic torque, and back electromotive force (back EMF), are presented for two, four, and six JFBs per rotor pole. The finite-element method (FEM) validates the proposed hybrid analytical method.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 3","pages":"1-23"},"PeriodicalIF":2.1,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496455","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

2024 Index IEEE Transactions on Magnetics Vol. 60 2024索引IEEE电磁学汇刊第60卷

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-14 DOI: 10.1109/TMAG.2025.3528776

引用次数: 0

Attenuation of Magnetic Effects in Soft Amorphous Ribbons

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-14 DOI: 10.1109/TMAG.2025.3529742

Ezio Puppin;Maurizio Zani;Ermanno Pinotti

{"title":"Attenuation of Magnetic Effects in Soft Amorphous Ribbons","authors":"Ezio Puppin;Maurizio Zani;Ermanno Pinotti","doi":"10.1109/TMAG.2025.3529742","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3529742","url":null,"abstract":"Magnetization reversals taking place in ferromagnetic materials can be detected using pickup coils wrapped around the sample, the so-called Barkhausen noise (BN). The voltage peaks induced in the coils depend both on the value <inline-formula> <tex-math>${Delta }M$ </tex-math></inline-formula> of each magnetization reversal and on the attenuation <inline-formula> <tex-math>$V(x)$ </tex-math></inline-formula> of the inductive signal after traveling a distance x inside the material. Here, we present a procedure for obtaining <inline-formula> <tex-math>$V(x)$ </tex-math></inline-formula> starting from the BN induced in two pickup coils separated by a distance variable between 2 and 40 mm. This procedure starts from the experimental values of R, the ratio of the signals induced in coincidence by the same magnetization reversal in the two coils, measured in a thin amorphous ribbon of Fe63B64Si8Ni15. Working with the signal ratio allows us to get rid of the dependency on <inline-formula> <tex-math>${Delta }M$ </tex-math></inline-formula>. A mathematical model for extracting <inline-formula> <tex-math>$V(x)$ </tex-math></inline-formula> from the histogram of the measured values of R is presented.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 3","pages":"1-6"},"PeriodicalIF":2.1,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496536","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

MAG-Vision: A Vision Transformer Backbone for Magnetic Material Modeling

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-09 DOI: 10.1109/TMAG.2025.3527486

Rui Zhang;Lei Shen

引用次数: 0

Simulation Study of High-Gradient Magnetic Chromatography

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-08 DOI: 10.1109/TMAG.2025.3526872

Petru Andrei;Nicholas Carlstedt

引用次数: 0

Nondestructive Ferromagnetic Resonance Measurements Validate the Efficacy of a Seed Layer in Cobalt Magnetic Nanowire Fabrication

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-08 DOI: 10.1109/TMAG.2025.3527341

Allison Harpel;Md Toaha Anas;Alex Wege;Rhonda R. Franklin;Bethanie J. H. Stadler

{"title":"Nondestructive Ferromagnetic Resonance Measurements Validate the Efficacy of a Seed Layer in Cobalt Magnetic Nanowire Fabrication","authors":"Allison Harpel;Md Toaha Anas;Alex Wege;Rhonda R. Franklin;Bethanie J. H. Stadler","doi":"10.1109/TMAG.2025.3527341","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3527341","url":null,"abstract":"Magnetic nanowires (MNWs) have been proposed for use in numerous applications due to their tunability and scale, but due to the same tunability that makes MNWs so versatile, tight quality control is needed to make the transition from research labs to industry. Currently, template-assisted electrodeposition is a promising fabrication method, but there is no quick, low-cost method to effectively quantify the fill factor (FF) of the templated wires. Here, we evaluate the efficacy of a copper seed layer to fabricate cobalt MNWs using quantitative ferromagnetic resonance (FMR). The deposition quality is assessed by FF and saturation magnetization (MS). First, the quality is evaluated by common, qualitative, or semiquantitative methods, which are then compared to the quantitative values measured from FMR. The copper seed layer is demonstrated to improve FF while maintaining MNW quality. For the seeded sample, FMR measured FF at 12.3% <inline-formula> <tex-math>$pm ~0.4$ </tex-math></inline-formula>%, with an MNW MS of <inline-formula> <tex-math>$1.64~pm ~0.10$ </tex-math></inline-formula> T. For the sample without a seed, FMR measured FF at 9.0% <inline-formula> <tex-math>$pm ~0.4$ </tex-math></inline-formula>% with an MNW MS of <inline-formula> <tex-math>$1.62~pm ~0.13$ </tex-math></inline-formula> T. These quantitative measurements were corroborated by all the qualitative and semiquantitative results, indicating that nondestructive FMR is a viable method to quantify FF and quickly evaluate the quality of templated MNWs.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 3","pages":"1-9"},"PeriodicalIF":2.1,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10833744","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496633","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}

引用次数: 0

Modeling of Hot Deformation Behavior of the Nd-Fe-B Permanent Magnet and Its Application in Forming of Magnetic Ring

IF 2.1 3区工程技术

IEEE Transactions on Magnetics Pub Date : 2025-01-08 DOI: 10.1109/TMAG.2025.3527030

Junyou Yang;Jun Li;Shaoxun Liu;Tao Liu;Lei Zhou;Xinghua Cheng;Xiaodong Li;Shuzhou Yu;Ying Chang;Xiaojun Yu;Bo Li

{"title":"Modeling of Hot Deformation Behavior of the Nd-Fe-B Permanent Magnet and Its Application in Forming of Magnetic Ring","authors":"Junyou Yang;Jun Li;Shaoxun Liu;Tao Liu;Lei Zhou;Xinghua Cheng;Xiaodong Li;Shuzhou Yu;Ying Chang;Xiaojun Yu;Bo Li","doi":"10.1109/TMAG.2025.3527030","DOIUrl":"https://doi.org/10.1109/TMAG.2025.3527030","url":null,"abstract":"Hot-deformed (HD) Nd-Fe-B magnet exhibits good magnetic and mechanical properties, which are dictated by the thermomechanical behavior of the feedstock during the hot deformation process. To enhance the HD magnet properties, the hot deformation behavior of the Nd-Fe-B material must be well understood and an accurate model of the process must be established and validated. In this work, the hot deformation behaviors of the Nd-Fe-B magnet were studied by experiments and simulations. Experiments were conducted using a thermomechanical simulator at temperatures ranging from 740 °C to 820 °C and the strain rates between 0.001 and 0.05 s−1. Results indicated that the flow stress was significantly affected by strain, temperature, and strain rate. Therefore, a modified constitutive model was developed to incorporate the effects of these three factors. The model achieved a correlation coefficient of 0.991, and further was implemented for the simulation of the forming processes. The simulated results matched the experimental ones very well. Furthermore, microstructural analysis and magnetic properties results showed the microstructure and magnetic properties were sensitive to temperature and strain rate, similar to the effective strain. Finally, the modified model was used to simulate the backward-extruded (BE) process for magnetic rings with high precision, verifying the applicability of the modified constitutive model. The method combining experiments, simulation, and microstructural analysis provides an efficient tool for obtaining high-performance HD magnets and designing process routes in engineering.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 3","pages":"1-13"},"PeriodicalIF":2.1,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496533","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