Multifunctional antiferromagnetic materials with giant piezomagnetism and noncollinear spin current

Hai-Yang Ma, Mengli Hu, Nana Li, Jianpeng Liu, Wang Yao, Jin-Feng Jia () and Junwei Liu ()
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Hai-Yang Ma: Shanghai Jiao Tong University
Mengli Hu: The Hong Kong University of Science and Technology
Nana Li: The Hong Kong University of Science and Technology
Jianpeng Liu: The Hong Kong University of Science and Technology
Wang Yao: University of Hong Kong
Jin-Feng Jia: Shanghai Jiao Tong University
Junwei Liu: The Hong Kong University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract We propose a new type of spin-valley locking (SVL), named C-paired SVL, in antiferromagnetic systems, which directly connects the spin/valley space with the real space, and hence enables both static and dynamical controls of spin and valley to realize a multifunctional antiferromagnetic material. The new emergent quantum degree of freedom in the C-paired SVL is comprised of spin-polarized valleys related by a crystal symmetry instead of the time-reversal symmetry. Thus, both spin and valley can be accessed by simply breaking the corresponding crystal symmetry. Typically, one can use a strain field to induce a large net valley polarization/magnetization and use a charge current to generate a large noncollinear spin current. We predict the realization of the C-paired SVL in monolayer V2Se2O, which indeed exhibits giant piezomagnetism and can generate a large transverse spin current. Our findings provide unprecedented opportunities to integrate various controls of spin and valley with nonvolatile information storage in a single material, which is highly desirable for versatile fundamental research and device applications.

Date: 2021
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DOI: 10.1038/s41467-021-23127-7

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