Damping of Confined Modes in a Ferromagnetic Thin Insulating Film: Angular Momentum Transfer across a Nanoscale Field-Defined Interface

Rohan Adur, Chunhui Du, Hailong Wang, Sergei A. Manuilov, Vidya P. Bhallamudi, Chi Zhang, Denis V. Pelekhov, Fengyuan Yang, and P. Chris Hammel
Phys. Rev. Lett. 113, 176601 – Published 21 October 2014

Abstract

We observe a dependence of the damping of a confined mode of precessing ferromagnetic magnetization on the size of the mode. The micron-scale mode is created within an extended, unpatterned yttrium iron garnet film by means of the intense local dipolar field of a micromagnetic tip. We find that the damping of the confined mode scales like the surface-to-volume ratio of the mode, indicating an interfacial damping effect (similar to spin pumping) due to the transfer of angular momentum from the confined mode to the spin sink of ferromagnetic material in the surrounding film. Though unexpected for insulating systems, the measured intralayer spin-mixing conductance g=5.3×1019m2 demonstrates efficient intralayer angular momentum transfer.

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  • Received 15 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.176601

© 2014 American Physical Society

Authors & Affiliations

Rohan Adur, Chunhui Du, Hailong Wang, Sergei A. Manuilov, Vidya P. Bhallamudi, Chi Zhang, Denis V. Pelekhov, Fengyuan Yang*, and P. Chris Hammel

  • Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA

  • *fyyang@physics.osu.edu
  • hammel@physics.osu.edu

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Vol. 113, Iss. 17 — 24 October 2014

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