Observation of spin-orbit effects with spin rotation symmetry

Alisha M. Humphries, Tao Wang, Eric R. J. Edwards, Shane R. Allen, Justin M. Shaw, Hans T. Nembach, John Q. Xiao, T. J. Silva and Xin Fan ()
Additional contact information
Alisha M. Humphries: University of Denver
Tao Wang: University of Delaware
Eric R. J. Edwards: National Institute of Standards and Technology
Shane R. Allen: University of Denver
Justin M. Shaw: National Institute of Standards and Technology
Hans T. Nembach: National Institute of Standards and Technology
John Q. Xiao: University of Delaware
T. J. Silva: National Institute of Standards and Technology
Xin Fan: University of Denver

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract The spin–orbit interaction enables interconversion between a charge current and a spin current. It is usually believed that in a nonmagnetic metal (NM) or at a NM/ferromagnetic metal (FM) bilayer interface, the symmetry of spin–orbit effects requires that the spin current, charge current, and spin orientation are all orthogonal to each other. Here we demonstrate the presence of spin–orbit effects near the NM/FM interface that exhibit a very different symmetry, hereafter referred to as spin-rotation symmetry, from the conventional spin Hall effect while the spin polarization is rotating about the magnetization. These results imply that a perpendicularly polarized spin current can be generated with an in-plane charge current simply by use of a FM/NM bilayer with magnetization collinear to the charge current. The ability to generate a spin current with arbitrary polarization using typical magnetic materials will benefit the development of magnetic memories.

Date: 2017
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DOI: 10.1038/s41467-017-00967-w

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