Thermally induced all-optical ferromagnetic resonance in thin YIG films

0571639 - FZÚ 2024 RIV US eng J - Journal Article
Schmoranzerová, E. - Kimák, J. - Schlitz, R. - Goennenwein, S.T.B. - Kriegner, Dominik - Reichlová, Helena - Šobáň, Zbyněk - Jakob, G. - Guo, E.-J. - Klaeui, M. - Muenzenberg, M. - Němec, P. - Ostatnický, T.
Thermally induced all-optical ferromagnetic resonance in thin YIG films.
New Journal of Physics. Roč. 25, č. 3 (2023), č. článku 033016. ISSN 1367-2630. E-ISSN 1367-2630
EU Projects: European Commission(XE) 766566 - ASPIN
Research Infrastructure: CzechNanoLab - 90110; CzechNanoLab II - 90251
Institutional support: RVO:68378271
Keywords : All-optical ferromag. resonance (AO-FMR) * thin YIG film * yttrium iron garnet * magneto-crystalline anisotropy * laser-induced magnetization precession
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.3, year: 2022
Method of publishing: Open access

All-optical ferromagnetic resonance (AO-FMR) is a powerful tool for the local detection of micromagnetic parameters, such as magnetic anisotropy, Gilbert damping or spin stiffness. In this work we demonstrate that the AO-FMR method can be used in thin films of yttrium iron garnet (YIG) if a metallic capping layer (Au, Pt) is deposited on top of the film. Magnetization precession is triggered by heating of the metallic layer with femtosecond laser pulses. The heat pulse modifies the magneto-crystalline anisotropy of the YIG film and shifts the quasi-equilibrium orientation of the magnetization, which results in precessional magnetization dynamics. The laser-induced magnetization precession corresponds to a uniform (Kittel) magnon mode, with the precession frequency determined by the magnetic anisotropy of the material as well as the external magnetic field, and the damping time set by a Gilbert damping parameter.

Permanent Link: https://hdl.handle.net/11104/0345986