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

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

doi:10.1103/physrevapplied.10.054046

Title: Near-T_c Ferromagnetic Resonance and Damping in FePt-Based Heat-Assisted Magnetic Recording Media

Journal Article · 19 November 2018 · Physical Review Applied

DOI: https://doi.org/10.1103/physrevapplied.10.054046 · OSTI ID:1613047

Richardson, Daniel ^[1]; Katz, Sidney ^[2]; Wang, J. ^[3]; Takahashi, Y. K. ^[3]; Srinivasan, Kumar ^[4]; Kalitsov, Alan ^[4]; Hono, K. ^[3]; Ajan, Antony ^[4]; Wu, Mingzhong ^[2]

Colorado State Univ., Fort Collins, CO (United States); DOE/OSTI
Colorado State Univ., Fort Collins, CO (United States)
National Inst. for Materials Science, Tsukuba (Japan)
Western Digital, San Jose, CA (United States)

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 (θ_H), 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. Here, 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 θ_H ≈ 45° when varying θ_H.

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Research Organization:: Colorado State Univ., Fort Collins, CO (United States)

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

Grant/Contract Number:: SC0018994

OSTI ID:: 1613047

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 5 Vol. 10; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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

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Title: Near-T_c Ferromagnetic Resonance and Damping in FePt-Based Heat-Assisted Magnetic Recording Media