Giant Anisotropy of Gilbert Damping in Epitaxial CoFe Films

Yi Li, Fanlong Zeng, Steven S.L. Zhang, Hyeondeok Shin, Hilal Saglam, Vedat Karakas, Ozhan Ozatay, John E. Pearson, Olle G. Heinonen, Yizheng Wu, Axel Hoffmann, Wei Zhang

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number117203
JournalPhysical review letters
Issue number11
StatePublished - Mar 21 2019
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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