Binh, Nguyen Thanh, Ruta, Sergiu, Hovorka, Ondrej et al. (2 more authors) (2022) Influence of finite-size effects on the Curie temperature of L10-FePt. Physical Review B. 054421. ISSN 2469-9969
Abstract
We employ an atomistic model using a nearest-neighbor Heisenberg Hamiltonian exchange to study computationally the dependence of the Curie temperature of L10-FePt on finite-size and surface effects in heat-assisted magnetic recording (HAMR) media. We demonstrate the existence of a size threshold at 3.5 nm below which the impact of finite-size effects starts to permeate into the center of the grains and contributes to the reduction of the Curie temperature. We find a correlation between the Curie temperature and the percentage of atomistic bonds lost on the surface as a function of grain size, which can be extended to apply to not only L10-FePt but also generic magnetic systems of any crystal structure. In a recording medium, the inevitable grain size dispersion leads to an irreducible contribution to the dispersion of the Curie temperature. Therefore, our paper gives insight into finite-size effects, which have been predicted to be a serious limitation of HAMR.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2022 American Physical Society. 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 > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 06 Oct 2022 11:50 |
Last Modified: | 25 Nov 2024 00:40 |
Published Version: | https://doi.org/10.1103/PhysRevB.106.054421 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevB.106.054421 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:191771 |
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Filename: PhysRevB.106.054421.pdf
Description: Influence of finite-size effects on the Curie temperature of L10-FePt