| Autor: |
Humphries AM; Department of Physics and Astronomy, University of Denver, Denver, CO, 80210, USA., Wang T; Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA., Edwards ERJ; Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, 80305, USA., Allen SR; Department of Physics and Astronomy, University of Denver, Denver, CO, 80210, USA., Shaw JM; Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, 80305, USA., Nembach HT; Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, 80305, USA., Xiao JQ; Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA., Silva TJ; Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, 80305, USA., Fan X; Department of Physics and Astronomy, University of Denver, Denver, CO, 80210, USA. xin.fan@du.edu. |
| Abstrakt: |
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.Converting charge to spin currents using spin-orbit interactions has useful applications in spintronics but symmetry constraints can limit the control over spin polarization. Here the authors demonstrate spin-orbit effects with a different symmetry, which could help generate arbitrary spin polarizations. |
