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Spatially and time-resolved magnetization dynamics driven by spin-orbit torques

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Baumgartner M., Garello K., Mendil J., Avci C. O., Grimaldi E., Murer C., Feng J. X., Gabureac M., Stamm C., Acremann Y., Finizio S., Wintz S., Raabe J., Gambardella P.,
Project Spin-orbitronics in ferromagnets and antiferromagnets
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Original article (peer-reviewed)

Journal Nature Nanotechnology
Volume (Issue) 12(10)
Page(s) 980 - 986
ISBN 1748-3387
Title of proceedings Nature Nanotechnology
DOI 10.1038/nnano.2017.151

Open Access

URL https://arxiv.org/abs/1704.06402
Type of Open Access Repository (Green Open Access)

Abstract

Current-induced spin-orbit torques are one of the most effective ways to manipulate the magnetization in spintronic devices, and hold promise for fast switching applications in non-volatile memory and logic units. Here, we report the direct observation of spin-orbit-torque-driven magnetization dynamics in Pt/Co/AlOx dots during current pulse injection. Time-resolved X-ray images with 25 nm spatial and 100 ps temporal resolution reveal that switching is achieved within the duration of a subnanosecond current pulse by the fast nucleation of an inverted domain at the edge of the dot and propagation of a tilted domain wall across the dot. The nucleation point is deterministic and alternates between the four dot quadrants depending on the sign of the magnetization, current and external field. Our measurements reveal how the magnetic symmetry is broken by the concerted action of the damping-like and field-like spin-orbit torques and the Dzyaloshinskii-Moriya interaction, and show that reproducible switching events can be obtained for over 10(12) reversal cycles.
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