{"title":"Peculiar spin Hall magnetoresistance in polycrystalline WTe2/Ni80Fe20 heterostructures","authors":"Zong-kui Tian, Zi-yan Luo, Jun-jie Guo, Jin-min Ding, Yao-zhuang Nie, Qing-lin Xia, Yu Zhou, Guang-hua Guo","doi":"10.1063/5.0229028","DOIUrl":null,"url":null,"abstract":"Charge–spin interconversion is a key issue in spintronics. It gives rise to a series of new phenomena, such as spin Hall magnetoresistance (SMR). In the present work, we report the peculiar SMR behaviors in heterostructures composed of polycrystalline WTe2 nanoplate and Ni80Fe20(Py) film. We observe a negative SMR, which is contrary to the positive SMR usually measured in heavy metal/ferromagnet bilayers. We further observe a transition from negative to positive SMR with increasing thickness of the WTe2 layer, as well as SMR sign reversal with increasing temperature in heterostructures with thicker WTe2. The peculiar SMR behaviors in polycrystalline WTe2/Py heterostructures are attributed to the interface-induced spin current and its competition with the spin Hall-induced spin current. The findings in this work offer a fundamental input for the future exploitation of heterostructures based on two-dimensional transition metal dichalcogenides.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"40 1","pages":""},"PeriodicalIF":3.6000,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Physics Letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1063/5.0229028","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
Charge–spin interconversion is a key issue in spintronics. It gives rise to a series of new phenomena, such as spin Hall magnetoresistance (SMR). In the present work, we report the peculiar SMR behaviors in heterostructures composed of polycrystalline WTe2 nanoplate and Ni80Fe20(Py) film. We observe a negative SMR, which is contrary to the positive SMR usually measured in heavy metal/ferromagnet bilayers. We further observe a transition from negative to positive SMR with increasing thickness of the WTe2 layer, as well as SMR sign reversal with increasing temperature in heterostructures with thicker WTe2. The peculiar SMR behaviors in polycrystalline WTe2/Py heterostructures are attributed to the interface-induced spin current and its competition with the spin Hall-induced spin current. The findings in this work offer a fundamental input for the future exploitation of heterostructures based on two-dimensional transition metal dichalcogenides.
期刊介绍：
Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology.
In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics.
APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field.
Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.
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