Strungaru, Mara, Ruta, Sergiu, Evans, Richard F.L. orcid.org/0000-0002-2378-8203 et al. (1 more author) (2020) Model of Magnetic Damping and Anisotropy at Elevated Temperatures:Application to Granular FePt Films. Physical Review Applied. 014077. ISSN 2331-7019
Abstract
An understanding of the damping mechanism in finite-size systems and its dependence on temperature is a critical step in the development of magnetic nanotechnologies. In this work, nanosized materials are modeled via atomistic spin dynamics, the damping parameter being extracted from ferromagnetic resonance (FMR) simulations applied for FePt systems, generally used for heat-assisted magnetic recording media (HAMR). We find that the damping increases rapidly close to TC and the effect is enhanced with decreasing system size, which is ascribed to scattering at the grain boundaries. Additionally, FMR methods provide the temperature dependence of both damping and the anisotropy, which are important for the development of HAMR. Semianalytical calculations show that, in the presence of a grain-size distribution, the FMR line width can decrease close to the Curie temperature due to a loss of inhomogeneous line broadening. Although FePt has been used in this study, the results presented in the current work are general and valid for any ferromagnetic material.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details. |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > York Institute for Materials Research The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 22 Sep 2020 13:20 |
Last Modified: | 08 Feb 2025 00:39 |
Published Version: | https://doi.org/10.1103/PhysRevApplied.14.014077 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevApplied.14.014077 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:165762 |
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Description: Model of magnetic damping and anistrophy at elevated temperatures: application to granular FePt films