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, and Wei Zhang
Phys. Rev. Lett. 122, 117203 – Published 21 March 2019
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Abstract

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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  • Received 13 July 2018
  • Revised 30 November 2018

DOI:https://doi.org/10.1103/PhysRevLett.122.117203

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yi Li1,2, Fanlong Zeng3, Steven S.-L. Zhang2, Hyeondeok Shin4, Hilal Saglam2,5, Vedat Karakas2,6, Ozhan Ozatay2,6, John E. Pearson2, Olle G. Heinonen2, Yizheng Wu3,7,*, Axel Hoffmann2,†, and Wei Zhang1,2,‡

  • 1Department of Physics, Oakland University, Rochester, Michigan 48309, USA
  • 2Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China
  • 4Computational Sciences Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Department of Physics, Illinois Institute of Technology, Chicago Illinois 60616, USA
  • 6Department of Physics, Bogazici University, Bebek 34342, Istanbul, Turkey
  • 7Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China

  • *wuyizheng@fudan.edu.cn
  • hoffmann@anl.gov
  • weizhang@oakland.edu

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Issue

Vol. 122, Iss. 11 — 22 March 2019

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