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Strong, anisotropic in-plane and out-of-plane damping-like spin-orbit torque in epitaxial RuO<sub>2</sub>

ORAL

Abstract

We study spin torques in RuO2/Permalloy bilayers grown on TiO2 substrates by second-harmonic Hall and spin-torque ferromagnetic resonance techniques [1]. Epitaxial RuO2 films exhibit a strong out-of-plane damping-like torque (OOP-DLT) that is anisotropic as a function of the orientation of current flow relative to the RuO2 crystal axes. This OOP-DLT is absent in similarly prepared IrO2/Permalloy samples despite the fact that RuO2 and IrO2 possess similar crystal structures [2]. This suggests that the recently-discovered antiferromagnetism in RuO2 [3] provides the symmetry breaking that allows the OOP-DLT [4]. We also observe a sizable in-plane damping-like torque originating from RuO2.

[1] arXiv:1801.09636
[2] arXiv:2006.04365
[3] PRL 118, 077201 (2017)
[4] arXiv:2002.07073

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Presenters

  • Arnab Bose

    Cornell University

Authors

  • Arnab Bose

    Cornell University

  • Nathaniel Schreiber

    Department of Materials Science and Engineering, Cornell University, Cornell University

  • Hari Nair

    Cornell University, Department of Materials Science and Engineering, Cornell University

  • Xiyue S Zhang

    School of Applied and Engineering Physics, Cornell University, Cornell University

  • Rakshit Jain

    Cornell University

  • Thow Min Jerald Cham

    Cornell University

  • Jiaxin Sun

    Department of Materials Science and Engineering, Cornell University, Cornell University

  • David Anthony Muller

    Cornell University, School of Applied and Engineering Physics, Cornell University

  • Robert Alan Buhrman

    Cornell University

  • Darrell Schlom

    Cornell University, Cornell university, Department of Materials Science and Engineering, Cornell University

  • Daniel C Ralph

    Cornell University