Detection of long-range orbital-Hall torques

Arnab Bose; Fabian Kammerbauer; Rahul Gupta; Dongwook Go; Yuriy Mokrousov; Gerhard Jakob; Mathias Klaeui

doi:10.1103/PhysRevB.107.134423

Detection of long-range orbital-Hall torques

Mesoscale and Nanoscale Physics 2023-04-21 v2

Authors: Arnab Bose , Fabian Kammerbauer , Rahul Gupta , Dongwook Go , Yuriy Mokrousov , Gerhard Jakob , Mathias Klaeui

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Abstract

We report and quantify a large orbital-Hall torque generated by Nb and Ru, which we identify from a strong dependence of torques on the ferromagnets. This is manifested as a sign reversal and strong enhancement in the damping-like torques measured in Nb (or Ru)/Ni bilayers as compared to Nb (or Ru)/FeCoB bilayers. The long-range nature of orbital transport in the ferromagnet is revealed by the thickness dependences of Ni in Nb (or Ru)/Ni bilayers which are markedly different from the regular spin absorption in the ferromagnet that takes place within a few angstroms and thus it uniquely distinguishes the orbital Hall torque from the spin Hall torque.

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@article{arxiv.2210.02283,
  title  = {Detection of long-range orbital-Hall torques},
  author = {Arnab Bose and Fabian Kammerbauer and Rahul Gupta and Dongwook Go and Yuriy Mokrousov and Gerhard Jakob and Mathias Klaeui},
  journal= {arXiv preprint arXiv:2210.02283},
  year   = {2023}
}

Detection of long-range orbital-Hall torques

Abstract

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