Thermally induced all-optical ferromagnetic resonance in thin YIG films

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...

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Bibliographic Details
Published in:New journal of physics 2023-03, Vol.25 (3), p.33016
Main Authors: Schmoranzerová, Eva, Kimák, Jozef, Schlitz, Richard, Goennenwein, Sebastian T B, Kriegner, Dominik, Reichlová, Helena, Šobáň, Zbyněk, Jakob, Gerhard, Guo, Er-Jia, Kläui, Mathias, Münzenberg, Markus, Němec, Petr, Ostatnický, Tomáš
Format: Article
Language:English
Subjects:
Anisotropy
Damping
Femtosecond pulsed lasers
Femtosecond pulses
Ferromagnetic materials
Ferromagnetic resonance
Gold
Heat pulses
Laser beam heating
Lasers
Magnetic anisotropy
Magnetic properties
Magnetization
Magnons
Parameters
Physics
Precession
Stiffness
term
Thin films
Yttrium-iron garnet
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Summary: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. The AO-FMR method thus enables measuring local magnetic properties, with a resolution given by the laser spot size.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/acc203