Near- Tc Ferromagnetic Resonance and Damping in FePt -Based Heat-Assisted Magnetic Recording Media

Daniel Richardson, Sidney Katz, J. Wang, Y. K. Takahashi, Kumar Srinivasan, Alan Kalitsov, K. Hono, Antony Ajan, M. Mingzhong

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

High-temperature ferromagnetic resonance (FMR) in FePt-based media materials is studied for the first time. The FMR linewidth (ΔH) as a function of temperature (T), field angle (θH), and the volume fraction (x) of carbon in the material is determined, and the effective Gilbert damping constant and the Bloch-Bloembergen relaxation time are estimated. The data suggest that at temperatures 10-45 K below the Curie temperature, two-magnon scattering and spin-flip magnon-electron scattering make comparable contributions to ΔH. With a decrease in T, ΔH increases due to enhancement of the two-magnon scattering. ΔH can be tuned via varying x and shows a maximum at θH≈45 when varying θH.

Original languageEnglish
Article number054046
JournalPhysical Review Applied
Volume10
Issue number5
DOIs
Publication statusPublished - 2018 Nov 20
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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