Current direction dependent spin Hall magnetoresistance in epitaxial Pt/Co bilayers on MgO(110)

Ryan Thompson, Jeongchun Ryu, Ye Du, Shutaro Karube, Makoto Kohda, Junsaku Nitta

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We demonstrate that the spin Hall magnetoresistance (SMR) of epitaxial Pt/Co bilayers on MgO(110) single crystal substrates is strongly anisotropic and depends on the applied current direction with respect to the two primary in-plane crystal directions [001] and [110], in the Pt layer. SMR results at different temperatures qualitatively suggest the D'yakonov-Perel spin relaxation mechanism through the invariance of the spin diffusion length λsf for a given current direction, while also suggesting an anisotropic Rashba-Edelstein effect from the ratio of λsf[001] to λsf[110]. Finally, deviation from the standard SMR model spurs the need for new theory that properly characterizes and quantifies the anisotropies in such epitaxial systems.

Original languageEnglish
JournalPhysical Review B
Volume101
Issue number21
DOIs
Publication statusPublished - 2020 Jun 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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