Time-resolved Brillouin light scattering study of magnon condensation

Brillouin light scattering spectroscopy (BLS) provides time-, space-, phase- and wavevector-resolved information of spin-waves. The BLS is a powerful method to investigate the nonlinear generation process of magnon, the quanta of spin wave. The Magnon Bose-Einstein condensation (magnon BEC) is one of the most fascinating nonlinear phenomena because a quantum condensate could be formed at room temperature. In this paper, we reported the scattering process of magnons using time-resolved BLS. The magnons were generated by a parametric pumping and the coherence of magnon was investigated by changing a duration of pumping pulse. (author)