Journal of Magnetism and Magnetic Materials最新文献

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Magnetic anisotropy and the hysteresis properties of antidot films with a hexagonal antidot lattice 具有六边形反点晶格的反点薄膜的磁各向异性和磁滞特性
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-11 DOI: 10.1016/j.jmmm.2025.173500
Nikita A. Kulesh , Aleksandr N. Gorkovenko , Vladimir O. Vas’kovskiy
{"title":"Magnetic anisotropy and the hysteresis properties of antidot films with a hexagonal antidot lattice","authors":"Nikita A. Kulesh ,&nbsp;Aleksandr N. Gorkovenko ,&nbsp;Vladimir O. Vas’kovskiy","doi":"10.1016/j.jmmm.2025.173500","DOIUrl":"10.1016/j.jmmm.2025.173500","url":null,"abstract":"<div><div>Antidot-patterned nanoscale films belong to a promising class of magnetic materials due to their shape-induced properties, which are advantageous for emerging technological applications, especially those leveraging periodically alternating spin textures. In this work, we performed a detailed micromagnetic analysis of antidot-patterned films with perpendicular magnetic anisotropy, considering both the symmetry of the antidot lattice and the local shape variations typical for films deposited onto a porous substrates. Specifically, we investigate the in-plane and out-of-plane anisotropy contributions in flat and locally curved geometries and simulate angular dependencies of hysteresis properties. Through micromagnetic modeling, we show that lattice symmetry imprints a six-fold in-plane anisotropy whose strength and phase depend on the hole diameter-to-spacing ratio, while local curvature and partial wall coverage modulate the effective perpendicular anisotropy. We further show that the angular dependencies of coercivity in films deposited onto a porous substrate can be reproduced by accounting for partial deposition of magnetic material into nanoholes. These insights clarify the coupling between local shape and macroscopic anisotropy in antidot films with perpendicular anisotropy and propose the design rules for hysteresis tailoring.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173500"},"PeriodicalIF":3.0,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A compensation method for electromagnetic hysteresis: Application in linear reluctance actuator 一种电磁滞回补偿方法:在线性磁阻执行器中的应用
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-11 DOI: 10.1016/j.jmmm.2025.173428
Qian Miao , Cheng Zhang , Yang Liu , Fazhi Song , Jiubin Tan
{"title":"A compensation method for electromagnetic hysteresis: Application in linear reluctance actuator","authors":"Qian Miao ,&nbsp;Cheng Zhang ,&nbsp;Yang Liu ,&nbsp;Fazhi Song ,&nbsp;Jiubin Tan","doi":"10.1016/j.jmmm.2025.173428","DOIUrl":"10.1016/j.jmmm.2025.173428","url":null,"abstract":"<div><div>The linear reluctance actuator is a specialized electromagnetic actuator that generates motion based on the reluctance effect. With its high force density and lower power consumption, it presents advantages over Lorentz actuators, which are commonly used in lithography machines. This actuator has the potential to overcome the physical limitations of voice coil motors, which struggle to achieve the high acceleration required for next-generation lithography systems. The complex hysteresis nonlinearity between current and magnetic flux density in linear reluctance actuator, stemming from electromagnetic hysteresis, eddy currents, and motion coupling, induces force deviations that limit their broader application. In this paper, we present a hysteresis model that relates current and flux, developed using flux measurements from sense coils. By integrating this model with the adaptive feedforward parameter tuning method, hysteresis nonlinearity is effectively compensated, enabling precise flux control. Experimental results demonstrate that the model effectively captures the actuator’s rate-dependent hysteresis behavior, and the proposed method effectively compensates for hysteresis nonlinearity.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173428"},"PeriodicalIF":3.0,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Localized integration of iron-based nanoparticle micromagnets on planar inductors for RF applications 平面射频电感器上铁基纳米微磁体的局部集成
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-10 DOI: 10.1016/j.jmmm.2025.173498
Mélik E. Maksem , Adrien Bourgine , Kosseila Ait-Oukaci , Angélique Gillet , Thierry Leïchlé , David Bourrier , Guillaume Viau , Nicolas Ratel-Ramond , Simon Cayez , Adeline Pham , Touati Douar , Damien Saugnon , Alexandre Rumeau , Thierry Parra , Thomas Blon , Lise-Marie Lacroix
{"title":"Localized integration of iron-based nanoparticle micromagnets on planar inductors for RF applications","authors":"Mélik E. Maksem ,&nbsp;Adrien Bourgine ,&nbsp;Kosseila Ait-Oukaci ,&nbsp;Angélique Gillet ,&nbsp;Thierry Leïchlé ,&nbsp;David Bourrier ,&nbsp;Guillaume Viau ,&nbsp;Nicolas Ratel-Ramond ,&nbsp;Simon Cayez ,&nbsp;Adeline Pham ,&nbsp;Touati Douar ,&nbsp;Damien Saugnon ,&nbsp;Alexandre Rumeau ,&nbsp;Thierry Parra ,&nbsp;Thomas Blon ,&nbsp;Lise-Marie Lacroix","doi":"10.1016/j.jmmm.2025.173498","DOIUrl":"10.1016/j.jmmm.2025.173498","url":null,"abstract":"<div><div>High permeability magnetic cores are often used in electronic components to concentrate electromagnetic field lines in order to enhance their radiofrequency properties or to reduce the device size while maintaining their performances. For that purpose, efficient magnetic materials are required, with major magnetic properties, dielectric behavior and soft techniques of integration. Here we present a new bottom-up approach for integrating localized magnetic dielectric materials onto planar inductors. Magnetic nanoparticles are first synthesized by a liquid-phase chemical approach and then assembled into submillimeter magnets onto inductors and coplanar waveguides by a magnetophoresis-directed process, performed at atmospheric pressure and room temperature. This approach allows a conformal deposition while limiting material losses. Permittivity and permeability of Fe, FeC and FeCo particles based-materials are extracted up to 30 GHz. Optimizing the magnetic properties of the magnets through the size and chemical composition of the nanoparticles allow increasing of 40 to 60 % the nominal inductance values of 2 and 13 nH up to 3 GHz. These results open new perspectives for the design of radio-frequency electronic micro-components.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173498"},"PeriodicalIF":3.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental study on magnetic particle polishing of the inner wall of a thin-walled tube based on a flexible magnetic pole chain 基于柔性磁极链的薄壁管内壁磁粉抛光实验研究
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-10 DOI: 10.1016/j.jmmm.2025.173492
Haoze Ma , Xuefeng Zhang , Zixin Li , Erwei Xie , Xiaogang Ma , Bin Han , Yue Han
{"title":"Experimental study on magnetic particle polishing of the inner wall of a thin-walled tube based on a flexible magnetic pole chain","authors":"Haoze Ma ,&nbsp;Xuefeng Zhang ,&nbsp;Zixin Li ,&nbsp;Erwei Xie ,&nbsp;Xiaogang Ma ,&nbsp;Bin Han ,&nbsp;Yue Han","doi":"10.1016/j.jmmm.2025.173492","DOIUrl":"10.1016/j.jmmm.2025.173492","url":null,"abstract":"<div><div>To address the issues of weak magnetic field strength, low efficiency when processing hard materials, and inability to achieve the desired surface quality in existing magnetic particle grinding technology, a new method of magnetic particle grinding is proposed that utilizes a flexible magnetic pole chain to enhance magnetic field strength. Using Maxwell simulation to optimize the magnetic field arrangement pattern, it was determined that a 2-pole 120° arrangement is the optimal solution, with a magnetic induction intensity of 0.6 T. After introducing the flexible magnetic pole chain, the magnetic field strength was further enhanced to 1.5 T. Experiments showed that the grinding effect of the flexible magnetic pole chain with a spacing of 2 mm was superior to that of the flexible magnetic pole chain with a spacing of 0 mm, with a 5.95 % improvement in the reduction of surface roughnes. Based on the response surface method, the optimal process parameter combination was determined to be: relative rotational speed of 1 530 r·min<sup>−1</sup>, axial feed rate of 3.2 mm·s<sup>−1</sup>, and magnetic particle diameter of 125 μm. After processing with the optimal process parameters, the average surface roughness of the tube wall decreased from approximately 2.36 μm to 0.27 μm, with a surface quality improvement of approximately 88 %. The study indicates that the magnetic particle grinding method, which enhances magnetic field strength using flexible magnetic pole chains, can significantly improve magnetic field strength and processing efficiency.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173492"},"PeriodicalIF":3.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Austenite to strain glass transitions and enhanced magnetocaloric effect in differently processed multi-element Ni-(Co)-Mn-Sn-Ti Heusler alloys 不同加工方式的Ni-(Co)- mn - sn - ti多元素Heusler合金中奥氏体到应变玻璃的转变和磁热效应的增强
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-10 DOI: 10.1016/j.jmmm.2025.173497
Debottam Goswami , Gaurav Potnis , Anupam Bagdi , Jayanta Das
{"title":"Austenite to strain glass transitions and enhanced magnetocaloric effect in differently processed multi-element Ni-(Co)-Mn-Sn-Ti Heusler alloys","authors":"Debottam Goswami ,&nbsp;Gaurav Potnis ,&nbsp;Anupam Bagdi ,&nbsp;Jayanta Das","doi":"10.1016/j.jmmm.2025.173497","DOIUrl":"10.1016/j.jmmm.2025.173497","url":null,"abstract":"<div><div>We report the evolution of microstructure, magneto-structural transformations, and the processing-induced functional properties of Ni<sub>41.5</sub>Ti<sub>0.5</sub>Co<sub>9</sub>Mn<sub>39</sub>Sn<sub>10</sub> (at. %) suction cast rods (SCRs), and melt spun ribbons (MSRs). The adopted solidification rate was found to govern the evolution of microstructure, wherein slower solidification resulted in the formation of three phases (austenite, Ni<sub>3</sub>Sn and γ) within the SCRs, whereas the MSRs solidified into a homogeneous B2-ordered austenite undergoing strong martensitic transformation (MT). Annealing the SCRs homogenized the DO<sub>3</sub> phase into austenite, however, the γ phase was retained with a reduced vol. %. The MSRs displayed a higher equilibrium MT temperature of 280.1 K compared to 241.1 K in annealed SCRs, primarily owing to a larger mean grain size and a higher rapid-solidification-induced dislocation density (1.04 <span><math><mo>×</mo></math></span> 10<sup>13</sup>/m<sup>2</sup>). Dislocations and elemental Co/Ti substitutions within the ideal Heusler lattice acted as the defects, creating zones of random strain order in the MSR. Such domains possessing a characteristic tweed microstructure increased in size upon annealing, impeding the long-range strain order required for a forward MT. The occurrence of a gradual austenite to strain glass transition indicates that the annealed MSRs are expedient candidates for controlled strain release applications. The MSRs on the other hand were deemed suitable for magnetocaloric applications owing to excellent values of isothermal entropy change (13.86 J/kg/K), and relative cooling power (145.53 J/kg) achieved for a <span><math><mrow><mi>Δ</mi><mi>H</mi></mrow></math></span> = 7 T.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173497"},"PeriodicalIF":3.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mitigation of magnetic fields in overhead power lines through genetic algorithm-based electromechanical compensation 基于遗传算法机电补偿的架空电力线磁场抑制
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-09 DOI: 10.1016/j.jmmm.2025.173493
Eslam Mohamed Ahmed , Ahmed Sayed AbdElrazek , Ali Alkhafa , Khaled Hosny Ibrahim
{"title":"Mitigation of magnetic fields in overhead power lines through genetic algorithm-based electromechanical compensation","authors":"Eslam Mohamed Ahmed ,&nbsp;Ahmed Sayed AbdElrazek ,&nbsp;Ali Alkhafa ,&nbsp;Khaled Hosny Ibrahim","doi":"10.1016/j.jmmm.2025.173493","DOIUrl":"10.1016/j.jmmm.2025.173493","url":null,"abstract":"<div><div>The magnetic fields generated by overhead high-voltage transmission lines have attracted significant attention owing to their potential health risks. Various techniques have been developed to mitigate these fields, which are influenced by both the current flow and geometric configuration of overhead transmission lines (OHTLs). Mitigation strategies include electrical compensation, which adjusts the phase currents within permissible limits, and mechanical rearrangement, which optimizes the conductor placement under specific constraints. This study proposes an advanced approach that integrates electrical compensation optimized using a genetic algorithm (GA) with the mechanical reconfiguration of OHTLs. The electrical compensation is implemented by inserting a combination of reactive series and shunt elements in each phase, creating an imbalance in current. Passive series and shunt elements were optimized to achieve optimal electrical compensation. The GA is an evolutionary optimization method that provides more than one solution and does not require complex modeling, as in traditional optimization methods. The GA considers conductor positions and passive reactive elements as genes, with magnetic field minimization as the fitness function. The results show that passive-reactive compensation has a less significant effect on magnetic field mitigation than mechanical rearrangement because the current control is not continuous and is limited by the reactive elements. However, the lowest possible magnetic field levels are achieved when electrical compensation is combined with mechanical compensation. In the present study, two cases were tested using the proposed method. The results show that electrical compensation improves the mechanical rearrangement method by approximately 29% in Case 1 and 70% in Case 2.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173493"},"PeriodicalIF":3.0,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145027241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimized design of medium-scale HTS coil for power stability enhancement using multi-objective exact enumeration 基于多目标精确枚举法的中等规模高温超导线圈功率稳定性优化设计
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-09 DOI: 10.1016/j.jmmm.2025.173480
B. Garkki, S. Revathi
{"title":"Optimized design of medium-scale HTS coil for power stability enhancement using multi-objective exact enumeration","authors":"B. Garkki,&nbsp;S. Revathi","doi":"10.1016/j.jmmm.2025.173480","DOIUrl":"10.1016/j.jmmm.2025.173480","url":null,"abstract":"<div><div>High-temperature superconductors (HTS) coils store energy in an electromagnetic field at cryogenic temperatures and can be integrated with renewable energy sources to enhance power stability during disturbances. This article proposes the optimal design of a 2.6 MJ medium-scale yttrium barium copper oxide (YBCO)-based HTS coil using a multi-objective exact enumeration method. In practical operations, time-varying currents during power compensation generate AC losses, which impact the performance of the HTS coil. To address these challenges, this study carefully considers various physical, mechanical, and economic factors in the design process. The primary objectives are to maximize stored energy while minimizing AC losses, coil weight, stress, and overall cost, aiming to achieve an optimal 2.6 MJ coil design. The study begins with a microstructure analysis of the HTS coil under both critical and zero current conditions at liquid nitrogen temperatures, followed by an exploration of optimal design solutions for the 2.6 MJ HTS coil under various applied current conditions. The final part involves designing and evaluating a prototype of the double-pancake (DP) coil using YBCO HTS tape. The analytical results are validated against finite element method (FEM) simulations to ensure the accuracy and robustness of the proposed design.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173480"},"PeriodicalIF":3.0,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Theory meets experiment: Insights into structure and magnetic properties of Fe1-xNixB alloy 理论与实验相结合:Fe1-xNixB合金的结构与磁性能研究
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-08 DOI: 10.1016/j.jmmm.2025.173483
Gourab Bhaskar , Zhen Zhang , Yaroslav Mudryk , Sergey L. Bud’ko , Vladimir P. Antropov , Julia V. Zaikina
{"title":"Theory meets experiment: Insights into structure and magnetic properties of Fe1-xNixB alloy","authors":"Gourab Bhaskar ,&nbsp;Zhen Zhang ,&nbsp;Yaroslav Mudryk ,&nbsp;Sergey L. Bud’ko ,&nbsp;Vladimir P. Antropov ,&nbsp;Julia V. Zaikina","doi":"10.1016/j.jmmm.2025.173483","DOIUrl":"10.1016/j.jmmm.2025.173483","url":null,"abstract":"<div><div>We studied the structural and magnetic properties of the solid solution Fe<sub>1-x</sub>Ni<sub>x</sub>B through theoretical and experimental approaches. Powder X-ray diffraction, X-ray Pair Distribution Function analysis, and energy dispersive X-ray spectroscopy reveal that the Fe<sub>1-x</sub>Ni<sub>x</sub>B solid solution crystallizes in the β-FeB structure type up to x  = 0.6–0.7 and exhibits anisotropic unit cell volume contraction with increasing Ni concentration. Magnetic measurements showed a transition from ferromagnetism to paramagnetism around x  = 0.7. For x  = 0.5, the low (&lt; 0.3 μ<sub>B</sub>) magnetic moments suggest itinerant magnetism despite the relatively high Curie temperature (up to 225 K). Theoretical calculations indicated different types of magnetic orderings depending on the Fe/Ni atomic order, with the antiferromagnetic state being stable for ordered FeNiB<sub>2</sub>, whereas the ground state is ferromagnetic for the disordered alloy. Calculations also predicted the coexistence of low- and high-spin states in Fe atoms around the composition with x = 0.5, in line with the experimental evidence from <sup>57</sup>Fe Mössbauer spectroscopy. The two magnetically distinct Fe sites for x  = 0.3, 0.4, and 0.5 observed by <sup>57</sup>Fe Mössbauer spectroscopy can also be interpreted as two magnetically different regions or clusters. The formation of these clusters could affect the critical behavior near a quantum magnetic transition based on a potential ferromagnetic quantum critical point identified computationally and experimentally near x = 0.64. This work highlights the complex interplay between structure and magnetism in Fe<sub>1-x</sub>Ni<sub>x</sub>B alloys, suggesting areas for future research on quantum critical behavior.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173483"},"PeriodicalIF":3.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural, electronic, and magnetic properties of Co2HfZ (Z = Al and Sn) Heusler alloys for spintronic and caloric applications 用于自旋电子和热应用的Co2HfZ (Z = Al和Sn) Heusler合金的结构、电子和磁性能
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-06 DOI: 10.1016/j.jmmm.2025.173481
Karumuri Venkanna , C.H. Prashanth , Abhijit Nayak , P. Rambabu , Bheema Lingam Chittari , Krishnamurthy Jyothinagaram
{"title":"Structural, electronic, and magnetic properties of Co2HfZ (Z = Al and Sn) Heusler alloys for spintronic and caloric applications","authors":"Karumuri Venkanna ,&nbsp;C.H. Prashanth ,&nbsp;Abhijit Nayak ,&nbsp;P. Rambabu ,&nbsp;Bheema Lingam Chittari ,&nbsp;Krishnamurthy Jyothinagaram","doi":"10.1016/j.jmmm.2025.173481","DOIUrl":"10.1016/j.jmmm.2025.173481","url":null,"abstract":"<div><div>This report examines the structural, phonon, thermoelectric, and magnetocaloric properties of Co<sub>2</sub>HfZ (Z = Al, Sn) full-Heusler alloys (FHA) through the application of density functional theory (DFT) and Monte Carlo simulations. Co<sub>2</sub>HfAl and Co<sub>2</sub>HfSn systems demonstrate half-metallic (HF) behavior with calculated lattice parameters measuring 6.0190 Å and 6.2199 Å, respectively. The minority spin bands exhibit an indirect band gap of 1.02 eV for Co<sub>2</sub>HfAl and 1.61 eV for Co<sub>2</sub>HfSn, whereas the majority spin bands persist in a metallic state. The estimated ferromagnetic (FM) transition temperature (<em>T</em><sub>C</sub>) is 170 K for Co<sub>2</sub>HfAl and 405 K for Co<sub>2</sub>HfSn. The phonon calculations reveal that both alloys exhibit dynamic stability and are devoid of soft modes, whereas thermoelectric evaluations indicate that for Co<sub>2</sub>HfAl, the Seebeck coefficient (S) remains marginally positive near the Fermi level across the examined Chemical potential (μ) range and increases with temperature, indicating stable <em>p</em>-type behavior with improved performance at elevated temperatures. In contrast, Co<sub>2</sub>HfSn displays a sign change in S with μ and temperature, trending toward more negative values at higher T, which signifies a shift toward enhanced <em>n</em>-type conduction. The research further evaluates the temperature-dependent magnetization and magnetic refrigeration (MR) properties. The maximum value of isothermal entropy change (−Δ<em>S<sub>m</sub>)</em><sub>max</sub> varies from 0.25 to 2.85 Jkg<sup>-1</sup>K<sup>−1</sup> for Co<sub>2</sub>HfAl and from 0.1 to 1.8 Jkg<sup>-1</sup>K<sup>−1</sup> for Co<sub>2</sub>HfSn. The RCP measures 11.02 Jkg<sup>−1</sup> and 14.80 Jkg<sup>−1</sup> at <em>H</em> = 1 T for Co<sub>2</sub>HfAl and Co<sub>2</sub>HfSn, respectively, increasing to 235.58 Jkg<sup>−1</sup> and 312.79 Jkg<sup>−1</sup> for <em>H</em> = 17 T. The results highlight their promise for applications that prioritize energy efficiency in fields such as spintronics, thermoelectric, and solid-state refrigeration, offering considerable advantages for environmental sustainability.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"631 ","pages":"Article 173481"},"PeriodicalIF":3.0,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145020708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation of Co2FeSn nano-alloys by microwave hydrothermal-annealing and magnetic properties research 微波水热退火法制备Co2FeSn纳米合金及其磁性能研究
IF 3 3区 材料科学
Journal of Magnetism and Magnetic Materials Pub Date : 2025-09-05 DOI: 10.1016/j.jmmm.2025.173479
Zhixuan Liu , Di Lu , Xiangyi He , Xinlei Xue , Jing Wang , Yue Wang
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