Journal of Magnetism and Magnetic Materials最新文献_第2页

Effects of Lu-doping on the magnetic behaviour and ordering of (Ho1−xLux)2Fe2Si2C 掺杂 Lu 对 (Ho1-xLux)2Fe2Si2C 的磁性和有序性的影响

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-07 DOI: 10.1016/j.jmmm.2024.172631

Resta A. Susilo , J.M. Cadogan , W.D. Hutchison , M. Avdeev , S.J. Campbell

{"title":"Effects of Lu-doping on the magnetic behaviour and ordering of (Ho1−xLux)2Fe2Si2C","authors":"Resta A. Susilo , J.M. Cadogan , W.D. Hutchison , M. Avdeev , S.J. Campbell","doi":"10.1016/j.jmmm.2024.172631","DOIUrl":"10.1016/j.jmmm.2024.172631","url":null,"abstract":"<div><div>We have investigated the effects of Lu substitution on the magnetic behaviour and ordering of (Ho<math><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></math>Lu<math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math>)2Fe2Si2C (<math><mi>x</mi></math> = 0.32 and 0.46) by high-resolution neutron powder diffraction, magnetisation and specific heat over the temperature range 2 to 300 K. Our study has established that the antiferromagnetic (AFM) state is weakened upon Lu substitution and that the Néel temperature T<math><msub><mrow></mrow><mrow><mi>N</mi></mrow></msub></math> shifts towards lower temperature with increasing Lu content. The replacement of the magnetic Ho<math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> ion by the non-magnetic Lu<math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math> ion of smaller atomic radius, leads to a modification of the crystal field levels, as indicated by the specific heat measurements. Neutron diffraction data analysis reveals that the magnetic structure of undoped Ho2Fe2Si2C, which exhibits a commensurate, antiferromagnetic ordering of the Ho sublattice along the <math><mi>b</mi></math>-axis with a propagation vector k = [0, 0, <math><mfrac><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow></mfrac></math>], is maintained in the Lu-doped (Ho<math><msub><mrow></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></math>Lu<math><msub><mrow></mrow><mrow><mi>x</mi></mrow></msub></math>)2Fe2Si2C compounds.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"612 ","pages":"Article 172631"},"PeriodicalIF":2.5,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660797","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

Paramagnetic susceptibility and spin correlation function of ferromagnetic metals in the critical region 临界区铁磁金属的顺磁感应强度和自旋相关函数

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-07 DOI: 10.1016/j.jmmm.2024.172634

N.B. Melnikov , A.S. Gulenko , B.I. Reser

引用次数: 0

Bragg resonances in left-handed bigyrotropic media based on periodic ferromagnetic semiconductor 基于周期性铁磁半导体的左手大反转介质中的布拉格共振

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-07 DOI: 10.1016/j.jmmm.2024.172630

M.A. Morozova , O.V. Matveev , S.V. Grishin , A.V. Bogomolova , S.A. Nikitov

引用次数: 0

Chirality- and Rashba- related effects in the spin texture of a two-dimensional centrosymmetric ferromagnet: The case of the CrI3 bilayer 二维中心对称铁磁体自旋纹理中的手性和拉什巴效应：CrI3 双层的情况

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-06 DOI: 10.1016/j.jmmm.2024.172610

Sukanya Ghosh , Nataša Stojić , Nadia Binggeli

{"title":"Chirality- and Rashba- related effects in the spin texture of a two-dimensional centrosymmetric ferromagnet: The case of the CrI3 bilayer","authors":"Sukanya Ghosh , Nataša Stojić , Nadia Binggeli","doi":"10.1016/j.jmmm.2024.172610","DOIUrl":"10.1016/j.jmmm.2024.172610","url":null,"abstract":"<div><div>The newly discovered two-dimensional (2D) magnetic semiconductors such as CrI<math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math> have triggered a surge of interest stemming from their exotic spin-dependent properties and potential applications in spintronics and magneto-optoelectronics. Using first-principle density-functional-theory calculations, we investigate the properties of the spin-polarization texture in momentum space in the prototype 2D centrosymmetric ferromagnetic (FM) bilayer of CrI<math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math> with perpendicular magnetization, with a goal of identifying general features due to interlayer interaction and their microscopic origins in 2D centrosymmetric FM materials. The FM CrI<math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math> bilayer displays a rich in-plane spin texture in its highest valence bands. We show the existence of two distinct spin canting effects induced by the coupling of the two FM layers in establishing the in-plane spin texture. The first effect is generated by the mirror-related chirality of the layer stacking and the spin–orbit-polarized nature of the valence states, and yields the same canting on both layers. The second effect is a Rashba-related effect, which in a centrosymmetric ferromagnet induces in a single electronic state two opposite spin-canted components on the two layers, resulting in a notable frustration effect on the energy of the bonding states. Finally, we show that the above effects can be effectively used to manipulate the spin texture via compressive vertical strain, which induces in the FM CrI<math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math> bilayer valence-band-edge states with canted spins.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"612 ","pages":"Article 172610"},"PeriodicalIF":2.5,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660790","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

Droplet generation in a co-flowing microchannel under the non-uniform magnetic fields produced by an electric current loop 在电流环产生的非均匀磁场作用下，在共流微通道中产生液滴

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-06 DOI: 10.1016/j.jmmm.2024.172645

Mehdi Fadaei, Sahand Majidi, Hadi Shoeibi

{"title":"Droplet generation in a co-flowing microchannel under the non-uniform magnetic fields produced by an electric current loop","authors":"Mehdi Fadaei, Sahand Majidi, Hadi Shoeibi","doi":"10.1016/j.jmmm.2024.172645","DOIUrl":"10.1016/j.jmmm.2024.172645","url":null,"abstract":"<div><div>Micro-magnetofluidics, the study of fluid behavior under magnetic fields in microscale systems, is vital for applications like drug delivery, chemical synthesis, and lab-on-a-chip technologies. Controlling droplet size and formation frequency in these systems is challenging due to the complex interplay of magnetic forces and fluid dynamics. This study introduces a novel approach to control droplet generation in a co-flowing microchannel under a non-uniform magnetic field generated by an electric current loop. Critical parameters such as electric current intensity, continuous phase flow rate, and current loop position are systematically examined for their impact on droplet behavior. The results highlight the unique influence of the magnetic field configuration, specifically the electric current loop, in inducing a transition from dripping to jetting flow patterns with increasing current intensity, leading to larger droplets and reduced generation frequency. Additionally, a distinct behavior of droplet coalescence near the current loop, followed by re-separation, is observed when the loop is positioned downstream of the inlet. Moreover, increasing the continuous phase flow rate consistently reduced droplet size and increased generation frequency, regardless of the current loop’s position.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"612 ","pages":"Article 172645"},"PeriodicalIF":2.5,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660157","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

High-performance anisotropic Sm2Co17/Fe(Co) bulk nanocomposite magnets fabricated by two-step high-pressure thermal compression deformation 通过两步高压热压变形制造高性能各向异性 Sm2Co17/Fe(Co)块状纳米复合磁体

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-04 DOI: 10.1016/j.jmmm.2024.172640

Tiancong Li, Jieqiong Gao, Xiaohong Li, Jinyi wang, Li Lou, Yingxin Hua, Yiran Li, Wenyue Qin, Defeng Guo, Wei Li

{"title":"High-performance anisotropic Sm2Co17/Fe(Co) bulk nanocomposite magnets fabricated by two-step high-pressure thermal compression deformation","authors":"Tiancong Li, Jieqiong Gao, Xiaohong Li, Jinyi wang, Li Lou, Yingxin Hua, Yiran Li, Wenyue Qin, Defeng Guo, Wei Li","doi":"10.1016/j.jmmm.2024.172640","DOIUrl":"10.1016/j.jmmm.2024.172640","url":null,"abstract":"<div><div>In the realm of Sm2Co17 nanocomposite magnetic materials, it remains a challenge to fabricate anisotropic magnets by forming nanocrystalline Sm2Co17 phases with strong texture, alongside soft phases of small size and high soft phase content. In this paper, we present a novel approach for fabricating anisotropic Sm2Co17/Fe(Co) nanocomposite bulk magnets with a prominent (00l) texture of the Sm2Co17 phase, the 25 wt% content of the Fe(Co) phase, and a refined grain size of 25 nm. This fabrication is achieved using a two-step high-pressure thermal compression (HPTC) deformation process. The fabricated magnets exhibit a maximum energy product [(BH)max] of 20.0 MGOe with a pronounced magnetic anisotropy (Br///Br⊥ = 1.23). This result is 53 % higher than the previously reported largest value [(BH)max = 13.1 MGOe] for Sm2Co17-based nanocomposites. The magnets also exhibit a low remanence temperature coefficient (α = −0.014 %/°C) and a low coercivity temperature coefficient (β = −0.23 %/°C), demonstrating exceptional thermal stability. Our findings may improve the fabrication of anisotropic bulk Sm2Co17 nanostructure magnets for practical applications.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"612 ","pages":"Article 172640"},"PeriodicalIF":2.5,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660158","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}

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The influence of pre-sintering temperature on the structural, magnetic, and dielectric properties of Sr0.67La0.33Fe11.7Zn0.1Co0.2O19 ferrite 预烧结温度对 Sr0.67La0.33Fe11.7Zn0.1Co0.2O19 铁氧体结构、磁性和介电性质的影响

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-03 DOI: 10.1016/j.jmmm.2024.172641

Qingyang Meng , Wei Sun , Xucai Kan , Xiansong Liu , Sheng Gao , Hongjian Yang , Jian Yang , Zhixiang Wang , Yujie Liu

{"title":"The influence of pre-sintering temperature on the structural, magnetic, and dielectric properties of Sr0.67La0.33Fe11.7Zn0.1Co0.2O19 ferrite","authors":"Qingyang Meng , Wei Sun , Xucai Kan , Xiansong Liu , Sheng Gao , Hongjian Yang , Jian Yang , Zhixiang Wang , Yujie Liu","doi":"10.1016/j.jmmm.2024.172641","DOIUrl":"10.1016/j.jmmm.2024.172641","url":null,"abstract":"<div><div>The present study explores the impact of varying heat treatment temperatures on the magnetic properties, structural configuration and dielectric characteristics of Sr0.67La0.33Fe11.7Zn0.1Co0.2O19 ferrite. M-type ferrite was synthesized using the traditional solid-state method, with thermal treatment temperatures incrementally increasing from 1230 °C to 1310 °C. Pure M-phase strontium ferrite was achieved at temperatures above 1250 °C. The ideal pre-sintering temperature was identified as 1270 °C, where several factors coalesced to enhance the magnetic properties, including the completion of the solid-state reaction and the diminution of the easily magnetized c-axis, which together fostered the intensification of the superexchange interaction. At this temperature, the magnetic properties reached their zenith, with a saturation magnetization (Ms) of 84.81 emu/g, a remanence (Br) of 419 mT, and a coercivity (Hcj) of 3301 Oe. Additionally, the dielectric constant was significantly high at low frequencies but rapidly declined with increasing frequency, achieving its optimal performance at 1270 °C.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"611 ","pages":"Article 172641"},"PeriodicalIF":2.5,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142652559","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

Revisiting the assessment of magnetic texture of Rare-Earth Magnets: The role of coercivity 重新审视稀土磁体的磁性质地评估：矫顽力的作用

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-03 DOI: 10.1016/j.jmmm.2024.172639

Luis T. Quispe , Leonardo F. Antunes , A.A. Baldárrago-Alcántara , Wagner C. Macedo , Marcelo A. Rosa , Querem H.F. Rebelo , Leonardo U. Lopes , Sérgio M. Souza , Paulo A.P. Wendhausen

{"title":"Revisiting the assessment of magnetic texture of Rare-Earth Magnets: The role of coercivity","authors":"Luis T. Quispe , Leonardo F. Antunes , A.A. Baldárrago-Alcántara , Wagner C. Macedo , Marcelo A. Rosa , Querem H.F. Rebelo , Leonardo U. Lopes , Sérgio M. Souza , Paulo A.P. Wendhausen","doi":"10.1016/j.jmmm.2024.172639","DOIUrl":"10.1016/j.jmmm.2024.172639","url":null,"abstract":"<div><div>A crucial figure of merit of rare-earth magnets is their magnetic texture, because it is closely related to the maximum remanence a magnet can achieve, hence assessing the magnetic texture is pivotal in terms of magnet’s performance. Fernengel et al. (1996) developed a methodology based on magnetometry, which allows for a quick determination of the texture by calculating the degree of alignment 〈cosθ〉 from the remanent magnetization in directions parallel and perpendicular to the texture axis of the magnet. Although this method provided reliable values, its application was limited to magnets with high degrees of alignment (〈cosθ〉 > 95 %), a restriction that was corrected by Quispe et al. (2020). Nevertheless, recent experiments have indicated that the magnetometry technique can introduce errors in texture assessment when the magnet presents high levels of coercivity. This work presents an approach that incorporates a correction factor into the magnetometry technique, accounting for the effect of the coercivity and circumventing this error source in texture assessment. The proposed methodology has been successfully applied to magnets with varying levels of coercivity.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"612 ","pages":"Article 172639"},"PeriodicalIF":2.5,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660802","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

First-principles study of structural, elastic, mechanical, electronic, magnetic, optical, and thermoelectric properties of CoFeTe half-heusler alloy CoFeTe 半休斯勒合金结构、弹性、机械、电子、磁性、光学和热电特性的第一性原理研究

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-03 DOI: 10.1016/j.jmmm.2024.172628

A. Samih , E. Salmani , Hussein. Sabbah , R. El Fdil , Z. Fadil , Fohad Mabood Husain , Seong Cheol Kim , Chaitany Jayprakash Raorane

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A novel bulk magnetostrictive sensor for bending applications 用于弯曲应用的新型块状磁致伸缩传感器

IF 2.5 3区材料科学

Journal of Magnetism and Magnetic Materials Pub Date : 2024-11-02 DOI: 10.1016/j.jmmm.2024.172636

Mohammad Reza Karafi, Mina Poursadr

引用次数: 0