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Proceedings Paper

Transverse-spin-orbit effects in ferromagnetic metals (Conference Presentation)
Author(s): Xin Fan

Paper Abstract

Spin-charge conversion in a nonmagnetic material generally follows the spin Hall symmetry, i.e. the charge current, spin current and spin polarization are all orthogonal to each other. Similar spin-charge conversion has been studied in a ferromagnetic material, but only in the anomalous Hall configuration such that the spin polarization is parallel with the magnetization. There are very few studies on the configuration where the spin polarization is transverse to the magnetization, possibly due to the consideration of transverse spin dephasing. Here I will show that despite dephasing, transverse spin-orbit effects in ferromagnetic metals are significant and exhibit unique symmetries. From a purely symmetry-based argument, a charge current through a ferromagnet can generate a spin current with conventional spin Hall symmetry. If the spin polarization is transverse to magnetization, spin can precess, leading to a spin current with a different spin polarization. We refer to these two effects as the transverse spin Hall effects with conventional symmetry (TSHE-C) and spin rotation symmetry (TSHE-SR), respectively. Both TSHE-C and TSHE-SR can generate transversely polarized spin current flowing within and out of the ferromagnet. The transversely polarized spin current flowing within the ferromagnet leads to anomalous spin-orbit torques at the surface of the ferromagnet. The transversely polarized spin current flowing out of the ferromagnet may possess a unconventional symmetry, allowing magnetization control of a second ferromagnet. The fact that ferromagnet itself can generate transversely polarized spin current may challenge the current understanding of spin-orbit effects including spin-orbit torque and spin pumping-spin galvanic effect.

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11090, Spintronics XII, 1109042 (10 September 2019); doi: 10.1117/12.2528066
Show Author Affiliations
Xin Fan, Univ. of Denver (United States)

Published in SPIE Proceedings Vol. 11090:
Spintronics XII
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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