Excitation and relaxation dynamics of spin-waves triggered by ultrafast photo-induced demagnetization in a ferrimagnetic insulator

Autor:	Hashimoto, Yusuke, Sato, Koji, Johansen, Tom H., Saitoh, Eiji
Rok vydání:	2020
Předmět:	Condensed Matter - Materials Science Physics - Applied Physics Physics - Optics
Druh dokumentu:	Working Paper
Popis:	Excitation and propagation dynamics of spin waves in an iron-based garnet film under out-of-plane magnetic field were investigated by time-resolved magneto-optical imaging. The experimental results and the following data analysis by phase-resolved spin-wave tomography reveal the excitation of spin waves triggered by photo-induced demagnetization (PID) along the sample depth direction. Moreover, the fast relaxation of PID accompanied by the spin transfer due to spin-wave emission was observed. Possible scenarios of PID in the garnet film are discussed. Finally, we develop a model for the spin-wave excitation triggered by PID and explain the magnetic-field dependence in the amplitude of the observed spin waves. Comment: 7 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2003.05159 Zobrazit plný text záznamu View this record from Arxiv