Room‐temperature tunable tunneling magnetoresistance in Fe3GaTe2/WSe2/Fe3GaTe2 van der Waals heterostructures

Author:

Pan Haiyang12,Singh Anil Kumar3,Zhang Chusheng1,Hu Xueqi1,Shi Jiayu4,An Liheng1,Wang Naizhou1,Duan Ruihuan4,Liu Zheng4ORCID,Parkin Stuart S. P.5,Deb Pritam3,Gao Weibo167ORCID

Affiliation:

1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences Nanyang Technological University Singapore Singapore

2. School of Materials Science and Engineering Yancheng Institute of Technology Yancheng the People's Republic of China

3. Department of Physics Tezpur University (Central University) Tezpur India

4. School of Materials Science and Engineering Nanyang Technological University Singapore Singapore

5. Max Planck Institute of Microstructure Physics Halle (Saale) Germany

6. The Photonics Institute and Centre for Disruptive Photonic Technologies Nanyang Technological University Singapore Singapore

7. Center for Quantum Technologies National University of Singapore Singapore Singapore

Abstract

AbstractThe exceptional properties of two‐dimensional (2D) magnet materials present a novel approach to fabricate functional magnetic tunnel junctions (MTJ) by constructing full van der Waals (vdW) heterostructures with atomically sharp and clean interfaces. The exploration of vdW MTJ devices with high working temperature and adjustable functionalities holds great potential for advancing the application of 2D materials in magnetic sensing and data storage. Here, we report the observation of highly tunable room‐temperature tunneling magnetoresistance through electronic means in a full vdW Fe3GaTe2/WSe2/Fe3GaTe2 MTJ. The spin valve effect of the MTJ can be detected even with the current below 1 nA, both at low and room temperatures, yielding a tunneling magnetoresistance (TMR) of 340% at 2 K and 50% at 300 K, respectively. Importantly, the magnitude and sign of TMR can be modulated by a DC bias current, even at room temperature, a capability that was previously unrealized in full vdW MTJs. This tunable TMR arises from the contribution of energy‐dependent localized spin states in the metallic ferromagnet Fe3GaTe2 during tunnel transport when a finite electrical bias is applied. Our work offers a new perspective for designing and exploring room‐temperature tunable spintronic devices based on vdW magnet heterostructures.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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