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., …Scherbakov, A. V. (2016). Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films. Proceedings of SPIE, 9835(98351Q), https://doi.org/10.1117/12.2238020

• Journal Article Type: Article
• Acceptance Date: Apr 1, 2016
• Publication Date: Jul 1, 2016
• Deposit Date: Jan 3, 2017
• Publicly Available Date: Jan 3, 2017
• Journal: Proceedings of SPIE
• Print ISSN: 0277-786X
• Electronic ISSN: 1996-756X
• Publisher: Society of Photo-optical Instrumentation Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 9835
• Issue: 98351Q
• 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
• Related Public URLs: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=2532769
• Additional Information: Vladimir N. Kats ; Tatiana L. Linnik ; Alexey S. Salasyuk ; Andrew W. Rushforth ; Mu Wang, et al.; "Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films", Proc. SPIE 9835, Ultrafast Bandgap Photonics, 98351Q (July 1, 2016); doi:10.1117/12.2238020.; ; Copyright 2016 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.