Strongly Enhanced Gilbert Damping in 3 d Transition-Metal Ferromagnet Monolayers in Contact with the Topological Insulator $\mathrm{Bi_2Se_3}$

Hou, Y. S.; Wu, R. Q.

doi:10.1103/PhysRevApplied.11.054032

Title: Strongly Enhanced Gilbert Damping in 3 d Transition-Metal Ferromagnet Monolayers in Contact with the Topological Insulator $$\mathrm{Bi_2Se_3}$$

Journal Article · Fri May 10 00:00:00 EDT 2019 · Physical Review Applied

DOI:https://doi.org/10.1103/PhysRevApplied.11.054032· OSTI ID:1527175

Hou, Y. S. ^[1]; Wu, R. Q. ^[1]

Univ. of California, Irvine, CA (United States)

Engineering Gilbert damping of ferromagnetic metal films is of great importance to exploit and design spintronic devices that are operated with an ultrahigh speed. Based on the scattering theory of Gilbert damping, we extend the torque method originally used in studies of magnetocrystalline anisotropy to theoretically determine Gilbert dampings of ferromagnetic metals. This method is utilized to investigate Gilbert dampings of 3d transition-metal ferromagnet iron, cobalt, and nickel monolayers that are contacted by the prototypical topological insulator Bi₂Se₃. Amazingly, we find that their Gilbert dampings are strongly enhanced by about one order of magnitude compared with dampings of their bulk forms and free-standing monolayers due to the strong spin-orbit coupling of $$\mathrm{Bi_2Se_3}$$. Finally, our work provides an attractive route for tailoring Gilbert damping of ferromagnetic metallic films by putting them in contact with topological insulators.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46237

OSTI ID:: 1527175

Journal Information:: Physical Review Applied, Vol. 11, Issue 5; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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