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X-ray spectroscopy of current-induced spin-orbit torques and spin accumulation in Pt/3d-transition-metal bilayers

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Stamm C., Murer C., Acremann Y., Baumgartner M., Gort R., Daster S., Kleibert A., Garello K., Feng J., Gabureac M., Chen Z., Stohr J., Gambardella P.,
Project Spin-orbitronics in ferromagnets and antiferromagnets
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 100(2)
Page(s) 024426 - 024426
ISBN 2469-9950
Title of proceedings Physical Review B
DOI 10.1103/physrevb.100.024426

Open Access

URL https://arxiv.org/abs/1904.00877
Type of Open Access Repository (Green Open Access)

Abstract

An electric current flowing in Pt, a material with strong spin-orbit coupling, leads to spins accumulating at the interfaces by virtue of the spin Hall effect and interfacial charge-spin conversion. We measure the influence of these interfacial magnetic moments onto adjacent 3d transition-metal layers by x-ray absorption spectroscopy and x-ray magnetic circular dichroism in a quantitative and element-selective way, with sensitivity below 10(-5)mu B per atom. In Pt(6 nm)/Co(2.5 nm), the accumulated spins cause a deviation of the Co magnetization direction, which corresponds to an effective spin Hall angle of 0.08. The spin and orbital magnetic moments of Co are affected in equal proportion by the absorption of the spin current, showing that the transfer of orbital momentum from the recently predicted orbital Hall effect is either below our detection limit, or not directed to the 3d states of Co. For Pt/NM (NM = Ti, Cr, Cu), we find upper limits for the amount of injected spins corresponding to about 3 x 10(-6)mu(B) per atom.
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