Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films
Ultrafast optical excitation of a metal ferromagnetic film results in a modification of the magnetocrystalline anisotropy and induces the magnetization precession. We consider two main contributions to these processes: an effect of noncoherent phonons, which modifies the temperature dependent parame...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
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American Physical Society
2016
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| Online Access: | https://eprints.nottingham.ac.uk/37050/ |
| _version_ | 1848795382233956352 |
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| author | Kats, V.N. Linnik, T.L. Salasyuk, A.S. Rushforth, A.W. Wang, M. Wadley, P. Akimov, Andrey V. Cavill, S.A. Holy, V. Kalashnikova, A.M. Scherbakov, A.V. |
| author_facet | Kats, V.N. Linnik, T.L. Salasyuk, A.S. Rushforth, A.W. Wang, M. Wadley, P. Akimov, Andrey V. Cavill, S.A. Holy, V. Kalashnikova, A.M. Scherbakov, A.V. |
| author_sort | Kats, V.N. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Ultrafast optical excitation of a metal ferromagnetic film results in a modification of the magnetocrystalline anisotropy and induces the magnetization precession. We consider two main contributions to these processes: an effect of noncoherent phonons, which modifies the temperature dependent parameters of the magnetocrystalline anisotropy and coherent phonons in the form of a strain contributing via inverse magnetostriction. Contrary to earlier experiments with high-symmetry ferromagnetic structures, where these mechanisms could not be separated, we study the magnetization response to femtosecond optical pulses in the low-symmetry magnetostrictive galfenol film so that it is possible to separate the coherent and noncoherent phonon contributions. By choosing certain experimental geometry and external magnetic fields, we can distinguish the contribution from a specific mechanism. Theoretical analysis and numerical calculations are used to support the experimental observations and proposed model. |
| first_indexed | 2025-11-14T19:31:12Z |
| format | Article |
| id | nottingham-37050 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:31:12Z |
| publishDate | 2016 |
| publisher | American Physical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-370502020-05-04T17:56:06Z https://eprints.nottingham.ac.uk/37050/ Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films Kats, V.N. Linnik, T.L. Salasyuk, A.S. Rushforth, A.W. Wang, M. Wadley, P. Akimov, Andrey V. Cavill, S.A. Holy, V. Kalashnikova, A.M. Scherbakov, A.V. Ultrafast optical excitation of a metal ferromagnetic film results in a modification of the magnetocrystalline anisotropy and induces the magnetization precession. We consider two main contributions to these processes: an effect of noncoherent phonons, which modifies the temperature dependent parameters of the magnetocrystalline anisotropy and coherent phonons in the form of a strain contributing via inverse magnetostriction. Contrary to earlier experiments with high-symmetry ferromagnetic structures, where these mechanisms could not be separated, we study the magnetization response to femtosecond optical pulses in the low-symmetry magnetostrictive galfenol film so that it is possible to separate the coherent and noncoherent phonon contributions. By choosing certain experimental geometry and external magnetic fields, we can distinguish the contribution from a specific mechanism. Theoretical analysis and numerical calculations are used to support the experimental observations and proposed model. American Physical Society 2016-06-17 Article PeerReviewed Kats, V.N., Linnik, T.L., Salasyuk, A.S., Rushforth, A.W., Wang, M., Wadley, P., Akimov, Andrey V., Cavill, S.A., Holy, V., Kalashnikova, A.M. and Scherbakov, A.V. (2016) Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films. Physical Review B, 93 (21). 214422-1-214422-10. ISSN 2469-9969 http://journals.aps.org/prb/abstract/10.1103/PhysRevB.93.214422 doi:10.1103/PhysRevB.93.214422 doi:10.1103/PhysRevB.93.214422 |
| spellingShingle | Kats, V.N. Linnik, T.L. Salasyuk, A.S. Rushforth, A.W. Wang, M. Wadley, P. Akimov, Andrey V. Cavill, S.A. Holy, V. Kalashnikova, A.M. Scherbakov, A.V. Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films |
| title | Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films |
| title_full | Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films |
| title_fullStr | Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films |
| title_full_unstemmed | Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films |
| title_short | Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films |
| title_sort | ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films |
| url | https://eprints.nottingham.ac.uk/37050/ https://eprints.nottingham.ac.uk/37050/ https://eprints.nottingham.ac.uk/37050/ |