Fast switching and signature of efficient domain wall motion driven by spin-orbit torques in a perpendicular anisotropy magnetic insulator/Pt bilayer
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Beach_Fast Switching.pdf
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Author(s)
Baumgartner, Manuel
Gambardella, Pietro
Avci, Can Onur
Rosenberg, Ethan Raphael
Beran, Lukas
Quindeau, Andy
Ross, Caroline A
Beach, Geoffrey Stephen
Date Issued
August 2017
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Avci, Can Onur et al. “Fast Switching and Signature of Efficient Domain Wall Motion Driven by Spin-Orbit Torques in a Perpendicular Anisotropy Magnetic insulator/Pt Bilayer.” Applied Physics Letters 111, 7 (August 2017): 072406 © 2017 Author(s)
Version
Final published version
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 ∼10¹²A/m², 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 ∼400 m/s per j = 10¹²A/m².
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1063/1.4994050
