Spin-Orbit-Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys
Name
PhysRevApplied.6.054001.pdf
Size
1.19 MB
Format
Adobe PDF
Checksum (MD5)
3723fa2d1c11aae894c29fca847d08bd
Author(s)
Finley, Joseph Tyler
Liu, Luqiao
Date Issued
November 2016
Journal
Physical Review Applied
Publisher
American Physical Society
Citation
Finley, Joseph, and Luqiao Liu. “Spin-Orbit-Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys.” Physical Review Applied 6.5 (2016): n. pag. © 2016 American Physical Society
Version
Final published version
Abstract
Despite the potential advantages of information storage in antiferromagnetically coupled materials, it remains unclear whether one can control the magnetic-moment orientation efficiently because of the canceled magnetic moment. Here, we report spin-orbit-torque-induced magnetization switching of ferrimagnetic Co[subscript 1−x]Tb[subscript x] films with perpendicular magnetic anisotropy. Current-induced switching is demonstrated in all of the studied film compositions, including those near the magnetization compensation point. The spin-orbit-torque-induced effective field is further quantified in the domain-wall motion regime. A divergent behavior that scales with the inverse of magnetic moment is confirmed close to the compensation point, which is consistent with angular momentum conservation. Moreover, we also quantify the Dzyaloshinskii-Moriya interaction energy in the Ta/Co[subscript 1−x]Tb[subscript x] system and we find that the energy density increases as a function of the Tb concentration. The demonstrated spin-orbit-torque switching, in combination with the fast magnetic dynamics and minimal net magnetization of ferrimagnetic alloys, promises spintronic devices that are faster and with higher density than traditional ferromagnetic systems.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevApplied.6.054001
