Sampan-A-Pai, Sutee, Chureemart, Jessada, Chantrell, Roy W. orcid.org/0000-0001-5410-5615 et al. (5 more authors) (2019) Temperature and Thickness Dependence of Statistical Fluctuations of the Gilbert Damping in Co - Fe - B / Mg O Bilayers. Physical Review Applied. 044001. ISSN 2331-7019
Abstract
We theoretically investigate the temperature and thickness dependence of the effective Gilbert damping constant (α) in the Co-Fe-B/MgO system using atomistic spin dynamics. We consider a high damping constant at the interface layer and a low damping constant for the bulklike layers due to large interfacial spin-orbit coupling. We find a strong dependence of the effective Gilbert damping with the film thickness, in quantitative agreement with experimental data. The temperature dependence of the effective damping arising from thermal-spin fluctuations up to temperatures of 400 K is weak, with no apparent change over the studied temperature range. Interestingly, we find that the temperature produces a different effect: a statistical fluctuation of the Gilbert damping parameter for a given relaxation induced solely from the finite size of the system. This statistical variation of the Gilbert damping is an intrinsic effect and is important for spintronic devices operating at gigahertz frequencies, where the dynamic response must be carefully controlled.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 American Physical Society. Uploaded with permission of the publisher/copyright holder. 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) The University of York > York Institute for Materials Research |
Depositing User: | Pure (York) |
Date Deposited: | 30 Apr 2019 10:40 |
Last Modified: | 29 Dec 2024 00:10 |
Published Version: | https://doi.org/10.1103/PhysRevApplied.11.044001 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevApplied.11.044001 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:145500 |
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