Direct Observation of Spin Current Oscillation in a Ferromagnet

Author:

Du Mengyao1,Min Huiqian1ORCID,Xia Ke2,Hou Dazhi3,Wang Lei2ORCID,Qiu Zhiyong1ORCID

Affiliation:

1. Dalian University of Technology

2. Southeast University

3. University of Science and Technology of China

Abstract

Spin current is a crucial element in spintronics, and its diffusion in materials is typically characterized by monotonic decay. However, when the material hosting the spin current is also a magnet, the spin current is expected to exhibit spatial oscillations, the observation of which remains elusive. Here, we demonstrate the spatial oscillation of a spin current in a nickel film by measuring the thickness-dependent inverse spin Hall effect in Ni/YIG bilayers. The inverse spin Hall current in nickel is found to oscillate with its film thickness, in contrast to nonmagnetic materials, and that the oscillation period quantitatively agrees with theoretical predictions based on differences in the Fermi wave vector between majority and minority carriers. Our findings reveal a previously hidden behavior of spin-transport dynamics and identify a new degree of freedom for manipulating spin current, with potential implications for future spintronic devices. Published by the American Physical Society 2024

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Publisher

American Physical Society (APS)

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