Large voltage-induced modification of spin-orbit torques in Pt/Co/GdOx

Satoru Emori; Uwe Bauer; Seonghoon Woo; Geoffrey S. D. Beach

doi:10.1063/1.4903041

Large voltage-induced modification of spin-orbit torques in Pt/Co/GdOx

Materials Science 2014-12-04 v1

Authors: Satoru Emori , Uwe Bauer , Seonghoon Woo , Geoffrey S. D. Beach

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Abstract

We report on large modifications of current-induced spin-orbit torques in a gated Pt/Co/Gd-oxide microstrip due to voltage-driven O $^{2-}$ migration. The Slonczewski-like and field-like torques are quantified using a low-frequency harmonic technique based on the polar magneto-optical Kerr effect. Voltage-induced oxidation of Co enhances the Slonczewski-like torque by as much as an order of magnitude, and simultaneously reduces the anisotropy energy barrier by a factor of ~5. Such magneto-ionic tuning of interfacial spin-orbit effects may significantly enhance the efficiency of magnetization switching and provide additional degrees of freedom in spintronic devices.

Keywords

spin-orbit torques voltage-induced modification Pt/Co/GdOx magneto-ionic Slonczewski-like torque field-like torque magneto-optical Kerr effect O2- migration

Cite

@article{arxiv.1411.6153,
  title  = {Large voltage-induced modification of spin-orbit torques in Pt/Co/GdOx},
  author = {Satoru Emori and Uwe Bauer and Seonghoon Woo and Geoffrey S. D. Beach},
  journal= {arXiv preprint arXiv:1411.6153},
  year   = {2014}
}

Large voltage-induced modification of spin-orbit torques in Pt/Co/GdOx

Abstract

Keywords

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