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Fast switching and signature of efficient domain wall motion driven by spin-orbit torques in a perpendicular anisotropy magnetic insulator/Pt bilayer

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Avci C. O., Rosenberg E., Baumgartner M., Beran L., Quindeau A., Gambardella P., Ross C. A., Beach G. S. D.,
Project Spin-orbitronics in ferromagnets and antiferromagnets
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Original article (peer-reviewed)

Journal Applied Physics Letters
Volume (Issue) 111(7)
Page(s) 072406 - 072406
ISBN 0003-6951
Title of proceedings Applied Physics Letters
DOI 10.1063/1.4994050

Open Access

URL https://aip.scitation.org/doi/10.1063/1.4994050
Type of Open Access Repository (Green Open Access)

Abstract

We report fast and efficient current-induced switching of a perpendicular anisotropy magnetic insulator thulium iron garnet by using spin-orbit torques (SOT) from the Pt overlayer. We first show that, with quasi-DC (10 ms) current pulses, SOT-induced switching can be achieved with an external field as low as 2 Oe, making TmIG an outstanding candidate to realize efficient switching in heterostructures that produce moderate stray fields without requiring an external field. We then demonstrate deterministic switching with fast current pulses (<= 20 ns) with an amplitude of similar to 10(12) A/m(2), similar to all-metallic structures. We reveal that, in the presence of an initially nucleated domain, the critical switching current is reduced by up to a factor of five with respect to the fully saturated initial state, implying efficient current-driven domain wall motion in this system. Based on measurements with 2 ns-long pulses, we estimate the domain wall velocity of the order of similar to 400 m/s per j = 10(12) A/m(2). Published by AIP Publishing.
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