Large Negative Magnetoresistance in All‐2D‐Materials‐Based Spin Valves

Author:

Zhang Yu1,Zou Kaixin2,Gao Zhansheng1,Ma Yifei1,Xu Lingyun1,Lu Feng2,Luo Zhaochu3,Wang Wei-Hua2,Ning Shuai1ORCID,Luo Feng1

Affiliation:

1. Tianjin Key Laboratory of Rare Earth Materials and Applications School of Materials Science and Engineering Smart Sensing Interdisciplinary Science Center Nankai University Tianjin 300350 China

2. Department of Electronic Science and Engineering Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology Nankai University Tianjin 300350 China

3. State Key Laboratory of Artificial Microstructure and Mesoscopic Physics School of Physics Peking University Beijing 100871 China

Abstract

Two‐dimensional (2D) magnetic materials have attracted enormous interest and opened up a new direction to novel spintronic applications. Herein, a large negative magnetoresistance (MR) in all‐2D‐materials‐based vertical magnetic spin valves with nano/micro bubbles existing at the interface between the spacer layer (MoS2) and the top ferromagnetic electrode layer (Cr0.85Te or Fe3GeTe2) is demonstrated. The large negative MR, with a magnitude of ≈21.5% attained in Cr0.85Te/MoS2/Fe3GeTe2, could be fully suppressed by the elimination of the bubbles after a short argon‐protected annealing, indicating the determining role of the bubbles in modulating the spin‐related transport behavior. First‐principles calculations based on density function theory (DFT) illustrate that the compressive strain can significantly modify the spin‐resolved electronic band structures of the 2D ferromagnetic materials, and hence alter the spin polarization near the Fermi level, accounting for the negative MR phenomena with the conventional two‐current model. Herein, a new route to all‐2D‐materials‐based spintronic devices via strain engineering is provided, and also offers a new insight into the role of bubbles formed during fabricating 2D heterostructures in developing exotic properties and novel functionalities.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Condensed Matter Physics,General Materials Science

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