Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films

Kats, Vladimir N.; Linnik, Tatiana L.; Salasyuk, Alexey S.; Rushforth, Andrew W.; Wang, Mu; Wadley, Peter; Akimov, Andrey V.; Cavill, Stuart A.; Holy, Vaclav; Kalashnikova, Alexandra M.; Scherbakov, Alexey V.

Abstract

Spin-lattice coupling is one of the most prominent interactions mediating response of spin ensemble to ultrafast optical excitation. Here we exploit optically generated coherent and incoherent phonons to drive coherent spin dynamics, i.e. precession, in thin films of magnetostrictive metal Galfenol. We demonstrate unambiguously that coherent phonons, also seen as dynamical strain generated due to picosecond lattice temperature raise, give raise to magnetic anisotropy changes of the optically excited magnetic film; and this contribution may be comparable to or even dominate over the contribution from the temperature increase itself, considered as incoherent phonons.

Citation

Kats, V. N., Linnik, T. L., Salasyuk, A. S., Rushforth, A. W., Wang, M., Wadley, P., Akimov, A. V., Cavill, S. A., Holy, V., Kalashnikova, A. M., & Scherbakov, A. V. (2016, April). Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films. Presented at SPIE Defense + Security, Baltimore, Maryland, United States

• Presentation Conference Type: Edited Proceedings
• Conference Name: SPIE Defense + Security
• Start Date: Apr 18, 2016
• End Date: Apr 20, 2016
• Acceptance Date: Apr 1, 2016
• Publication Date: Jul 1, 2016
• Deposit Date: Jan 3, 2017
• Publicly Available Date: Jan 3, 2017
• Peer Reviewed: Peer Reviewed
• Volume: 9835
• Article Number: 98351Q
• Series Title: SPIE - International Society for Optical Engineering. Proceedings
• Series ISSN: 1996-756X
• Book Title: Ultrafast Bandgap Photonics
• ISBN: 9781510600768
• DOI: https://doi.org/10.1117/12.2238020
• Keywords: laser-induced magnetization dynamics, magnetostrictive materials, magnetic anisotropy
• Public URL: https://nottingham-repository.worktribe.com/output/792083
• Publisher URL: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2532769
• Contract Date: Jan 3, 2017