发布求助

文献互助智能选刊最新文献

Electron spin resonance study of the van der Waals ferromagnet Fe5GeTe2

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-23 DOI:10.1016/j.jmmm.2025.173251

Yang Yang , Fanying Meng , Wei Liu , Jingxin Li , Jing Zhang , Jiyu Fan , Chunlan Ma , Min Ge , Li Pi , Zhe Qu , Lei Zhang

{"title":"Electron spin resonance study of the van der Waals ferromagnet Fe5GeTe2","authors":"Yang Yang , Fanying Meng , Wei Liu , Jingxin Li , Jing Zhang , Jiyu Fan , Chunlan Ma , Min Ge , Li Pi , Zhe Qu , Lei Zhang","doi":"10.1016/j.jmmm.2025.173251","DOIUrl":null,"url":null,"abstract":"<div><div>The van der Waals (vdW) material Fe<math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math>GeTe<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math> is a promising candidate for spintronic applications due to its high Curie temperature (<math><msub><mrow><mi>T</mi></mrow><mrow><mi>C</mi></mrow></msub></math>) and easily controllable properties. In this study, we thoroughly investigate the magnetic anisotropy of Fe<math><msub><mrow></mrow><mrow><mn>5</mn></mrow></msub></math>GeTe<math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math> single crystals using magnetization and electron spin resonance (ESR) techniques. We find that the magnetization for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>a</mi><mi>b</mi></mrow></math> is stronger than that for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>c</mi></mrow></math> below <math><mrow><msup><mrow><mi>T</mi></mrow><mrow><mo>∗</mo></mrow></msup><mo>∼</mo></mrow></math>100 K, exhibiting a weak easy-plane anisotropy (EPA). This EPA is significantly enhanced in the temperature range of <math><mrow><msup><mrow><mi>T</mi></mrow><mrow><mo>∗</mo></mrow></msup><mo><</mo><mi>T</mi><mo><</mo><msub><mrow><mi>T</mi></mrow><mrow><mi>C</mi></mrow></msub></mrow></math>, indicating an enhanced EPA effect. Meanwhile, the ESR spectra show weak intensity below <math><msup><mrow><mi>T</mi></mrow><mrow><mo>∗</mo></mrow></msup></math> while significantly anisotropic signals are observed in the enhanced EPA region, with stronger ESR intensity for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>a</mi><mi>b</mi></mrow></math> compared to that for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>c</mi></mrow></math>. The resonance fields (<math><msub><mrow><mi>H</mi></mrow><mrow><mi>r</mi></mrow></msub></math>) for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>a</mi><mi>b</mi></mrow></math> and <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>c</mi></mrow></math> display opposite trends. The resonance field <math><msubsup><mrow><mi>H</mi></mrow><mrow><mi>r</mi></mrow><mrow><mi>a</mi><mi>b</mi></mrow></msubsup></math> for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>a</mi><mi>b</mi></mrow></math> shifts toward lower fields, while <math><msubsup><mrow><mi>H</mi></mrow><mrow><mi>r</mi></mrow><mrow><mi>c</mi></mrow></msubsup></math> for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>c</mi></mrow></math> moves toward higher fields upon cooling. This contrary trends of <math><msub><mrow><mi>H</mi></mrow><mrow><mi>r</mi></mrow></msub></math> for <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>a</mi><mi>b</mi></mrow></math> and <math><mrow><mi>H</mi><mo>/</mo><mo>/</mo><mi>c</mi></mrow></math> are attributed to the effects of magnetocrystalline anisotropy and shape anisotropy, which are consistent with observations in two-dimensional ferromagnetic materials with EPA. These findings enhance our understanding of the magnetic correlations and spin dynamics in this system.</div></div>","PeriodicalId":366,"journal":{"name":"Journal of Magnetism and Magnetic Materials","volume":"629 ","pages":"Article 173251"},"PeriodicalIF":2.5000,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Magnetism and Magnetic Materials","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304885325004834","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The van der Waals (vdW) material Fe

_{5}

GeTe

_{2}

is a promising candidate for spintronic applications due to its high Curie temperature (

T_{C}

) and easily controllable properties. In this study, we thoroughly investigate the magnetic anisotropy of Fe

_{5}

GeTe

_{2}

single crystals using magnetization and electron spin resonance (ESR) techniques. We find that the magnetization for

H / / a b

is stronger than that for

H / / c

below

T^{*} \sim

100 K, exhibiting a weak easy-plane anisotropy (EPA). This EPA is significantly enhanced in the temperature range of

T^{*} < T < T_{C}

, indicating an enhanced EPA effect. Meanwhile, the ESR spectra show weak intensity below

T^{*}

while significantly anisotropic signals are observed in the enhanced EPA region, with stronger ESR intensity for

H / / a b

compared to that for

H / / c

. The resonance fields (

H_{r}

) for

H / / a b

and

H / / c

display opposite trends. The resonance field

H_{r}^{a b}

for

H / / a b

shifts toward lower fields, while

H_{r}^{c}

for

H / / c

moves toward higher fields upon cooling. This contrary trends of

H_{r}

for

H / / a b

and

H / / c

are attributed to the effects of magnetocrystalline anisotropy and shape anisotropy, which are consistent with observations in two-dimensional ferromagnetic materials with EPA. These findings enhance our understanding of the magnetic correlations and spin dynamics in this system.

查看原文本刊更多论文

范德华铁磁体Fe5GeTe2的电子自旋共振研究

范德华（vdW）材料Fe5GeTe2由于其高居里温度（TC）和易于控制的性质而成为自旋电子应用的有前途的候选者。在这项研究中，我们利用磁化和电子自旋共振（ESR）技术深入研究了Fe5GeTe2单晶的磁各向异性。我们发现在T∗~ 100 K以下，H//ab的磁化强度比H//c强，表现出弱的易平面各向异性（EPA）。该EPA在T * <；T<；TC温度范围内显著增强，表明EPA效应增强。同时，在T *以下的ESR谱表现出弱强度，而在增强的EPA区域则表现出显著的各向异性信号，其中H//ab的ESR谱强度高于H//c。H//ab和H//c的共振场（Hr）呈现相反的趋势。冷却后，H//ab的共振场Hrab向低场移动，H//c的共振场Hrc向高场移动。H//ab和H//c的磁晶各向异性和形状各向异性的影响导致了H//ab和H//c的相反趋势，这与用EPA在二维铁磁材料中观察到的结果一致。这些发现增强了我们对该系统的磁相关和自旋动力学的理解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.