Unconventional unidirectional magnetoresistance in heterostructures of a topological semimetal and a ferromagnet

IF 37.2 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
I-Hsuan Kao, Junyu Tang, Gabriel Calderon Ortiz, Menglin Zhu, Sean Yuan, Rahul Rao, Jiahan Li, James H. Edgar, Jiaqiang Yan, David G. Mandrus, Kenji Watanabe, Takashi Taniguchi, Jinwoo Hwang, Ran Cheng, Jyoti Katoch, Simranjeet Singh
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引用次数: 0

Abstract

Unidirectional magnetoresistance (UMR) in a bilayer heterostructure, consisting of a spin-source material and a magnetic layer, refers to a change in the longitudinal resistance on the reversal of magnetization and originates from the interaction of non-equilibrium spin accumulation and magnetization at the interface. Since the spin polarization of an electric-field-induced non-equilibrium spin accumulation in conventional spin-source materials is restricted to be in the film plane, the ensuing UMR can only respond to the in-plane component of magnetization. However, magnets with perpendicular magnetic anisotropy are highly desired for magnetic memory and spin-logic devices, whereas the electrical read-out of perpendicular magnetic anisotropy magnets through UMR is critically missing. Here we report the discovery of an unconventional UMR in the heterostructures of a topological semimetal (WTe2) and a perpendicular magnetic anisotropy ferromagnetic insulator (Cr2Ge2Te6), which allows to electrically read the up and down magnetic states of the Cr2Ge2Te6 layer through longitudinal resistance measurements.

Abstract Image

拓扑半金属和铁磁体异质结构中的非常规单向磁阻
单向磁阻(Unidirectional magnetoresistance, UMR)是指由自旋源材料和磁层组成的双层异质结构在磁化反转时纵向电阻的变化,它来源于界面处非平衡自旋积累和磁化的相互作用。由于传统自旋源材料中电场诱导的非平衡自旋积累的自旋极化被限制在薄膜平面内,因此随后的UMR只能响应平面内的磁化分量。然而,具有垂直磁各向异性的磁体在磁存储和自旋逻辑器件中是非常需要的,而垂直磁各向异性磁体通过UMR的电读出却严重缺失。在这里,我们报告了在拓扑半金属(WTe2)和垂直磁各向异性铁磁绝缘体(Cr2Ge2Te6)的异质结构中发现的非常规UMR,它允许通过纵向电阻测量电读取Cr2Ge2Te6层的上下磁态。
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来源期刊
Nature Materials
Nature Materials 工程技术-材料科学:综合
CiteScore
62.20
自引率
0.70%
发文量
221
审稿时长
3.2 months
期刊介绍: Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology. Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines. Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.
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