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Understanding magnetic damping behavior at finite temperatures is crucial for magnetization reversal, especially in heat-assisted magnetic recording (HAMR) media. In this paper, we calculate the intrinsic magnetic damping of L10-FePt, which is the prospective HAMR media, based on the Kamberský torque correlation model and the modified frozen thermal lattice disorder approach. Using the temperature-dependent scattering rate, the magnetic damping showed nonmonotonic behavior and slightly increased with increasing temperature, indicating that the lattice vibration enhances the interband transition around the Fermi level. Comparison of our results with the previous theoretical and experimental works clarified that, because the intrinsic damping of L10-FePt was always enhanced at high temperature, the reduction of the damping around the Curie temperature in the recent experiment emphasizes the importance of extrinsic contributions of damping for HAMR application.

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Keyword: First-principles calculations, Lattice dynamics, Magnetization dynamics, Spin-orbit torque

Date published: 2023-09-15

Publisher: American Physical Society (APS)

Journal:

• Physical Review B (ISSN: 24699969) vol. 108 094426

Funding:

• National Institute for Materials Science
• Japan Society for the Promotion of Science JP17H06152
• Japan Society for the Promotion of Science JP20H00299
• Japan Society for the Promotion of Science JP20H02190
• Japan Society for the Promotion of Science JP22H04966
• Research Institute of Electrical Communication, Tohoku University
• CSRN of Osaka University

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5168

First published URL: https://doi.org/10.1103/physrevb.108.094426

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Updated at: 2024-12-20 15:09:41 +0900

Published on MDR: 2024-12-20 16:31:37 +0900