Giant Anisotropy of Gilbert Damping in Epitaxial CoFe Films

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

doi:10.1103/PhysRevLett.122.117203

Title: Giant Anisotropy of Gilbert Damping in Epitaxial CoFe Films

Journal Article · Thu Mar 21 00:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.117203· OSTI ID:1505133

Li, Yi ^[1]; Zeng, Fanlong ^[2]; Zhang, Steven S. -L. ^[3]; Shin, Hyeondeok ^[4]; Saglam, Hilal ^[5]; Karakas, Vedat ^[6]; Ozatay, Ozhan ^[6]; Pearson, John E. ^[3]; Heinonen, Olle G. ^[3]; Wu, Yizheng ^[7]; Hoffmann, Axel ^[3]; Zhang, Wei ^[1]

Oakland Univ., Rochester, MI (United States). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Fudan Univ., Shanghai (China). State Key Lab. of Surface Physics. Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Argonne National Lab. (ANL), Argonne, IL (United States). Computational Sciences Division
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Illinois Inst. of Technology, Chicago, IL (United States). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Bogazici Univ., Istanbul (Turkey). Dept. of Physics
Fudan Univ., Shanghai (China). State Key Lab. of Surface Physics. Dept. of Physics; Collaborative Innovation Center of Advanced Microstructures, Nanjing (China)

Tailoring Gilbert damping of metallic ferromagnetic thin films is one of the central interests in spintronics applications. We report a giant Gilbert damping anisotropy in epitaxial $${\mathrm{Co}}_{50}{\mathrm{Fe}}_{50}$$ 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 $${\mathrm{Co}}_{50}{\mathrm{Fe}}_{50}$$.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Oakland Univ., Rochester, MI (United States); Fudan Univ., Shanghai (China); Bogazici Univ., Istanbul (Turkey); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Key Basic Research Program (China); National Key Research and Development Program (China); National Natural Science Foundation of China (NSFC); Program of Shanghai Academic Research Leader (China); Bogazici Univ. Research Fund (Turkey); Scientific and Technological Research Council of Turkey (TÜBİTAK)

Grant/Contract Number:: AC02-06CH11357; DMR-1808892; 2015CB921401; 2016YFA0300703; 11734006; 11474066; 11434003; 17XD1400400; 17B03D3; 2214/A; AC05-00OR22725

OSTI ID:: 1505133

Alternate ID(s):: OSTI ID: 1530068; OSTI ID: 1546199

Journal Information:: Physical Review Letters, Vol. 122, Issue 11; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 56 works

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