Current-Induced Domain Wall Motion in a Compensated Ferrimagnet
Name
PhysRevLett.121.057701.pdf
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1.52 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Siddiqui, Saima Afroz
Han, Jiahao
Finley, Joseph Tyler
Ross, Caroline A
Liu, Luqiao
Date Issued
July 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Siddiqui, Saima A., Jiahao Han, Joseph T. Finley, Caroline A. Ross and Luqiao Liu. "Current-Induced Domain Wall Motion in a Compensated Ferrimagnet." Physical Review Letters 121 (2018), 057701.
Version
Final published version
Abstract
Owing to the difficulty in detecting and manipulating the magnetic states of antiferromagnetic materials, studying their switching dynamics using electrical methods remains a challenging task. By employing heavy-metal–rare-earth–transition-metal alloy bilayers, we experimentally study current-induced domain wall dynamics in an antiferromagnetically coupled system. We show that the current-induced domain wall mobility reaches a maximum at the angular momentum compensation point. With experiment and modeling, we further reveal the internal structures of domain walls and the underlying mechanisms for their fast motion. We show that the chirality of the ferrimagnetic domain walls remains the same across the compensation points, suggesting that spin orientations of specific sublattices rather than net magnetization determine Dzyaloshinskii-Moriya interaction in heavy-metal–ferrimagnet bilayers. The high current-induced domain wall mobility and the robust domain wall chirality in compensated ferrimagnetic material opens new opportunities for high-speed spintronic devices.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.121.057701
