Giant Anisotropy of Gilbert Damping in Epitaxial CoFe Films

• Published in: Physical review letters Vol. 122; no. 11; p. 117203
• Main Authors: Li, Yi, Zeng, Fanlong, Zhang, Steven S-L, Shin, Hyeondeok, Saglam, Hilal, Karakas, Vedat, Ozatay, Ozhan, Pearson, John E, Heinonen, Olle G, Wu, Yizheng, Hoffmann, Axel, Zhang, Wei
• Format: Journal Article
• Language: English
• Published: United States American Physical Society 21-03-2019; American Physical Society (APS)
• Subjects: Anisotropy; Broadband; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Cubic lattice; Damping ratio; Ferromagnetic materials; Ferromagnetic resonance; Magnetism; magnetization dynamics; Magnetoresistance; Magnetoresistivity; spin-orbit coupling; Spintronics; Thin films
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/physrevlett.122.117203

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 Co_{50}Fe_{50} 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 Co_{50}Fe_{50}.