Published January 1, 2019
| Version v1
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Giant Anisotropy of Gilbert Damping in Epitaxial CoFe Films
Creators
- 1. Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
- 2. Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA
- 3. Argonne Natl Lab, Div Computat Sci, Argonne, IL 60439 USA
Description
Tailoring Gilbert damping of metallic ferromagnetic thin films is one of the central interests in spintronics applications. Here we report a giant Gilbert damping anisotropy in epitaxial Co50Fe50 thin films with a maximum-minimum damping ratio of 400%, determined by broadband spin-torque ferromagnetic resonance as well as inductive ferromagnetic resonance. We conclude that the origin of this damping anisotropy is the variation of the spin orbit coupling for different magnetization orientations in the cubic lattice, which is further corroborated from the magnitude of the anisotropic magnetoresistance in Co50Fe50.
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