Magnetization Dynamics in Antiferromagnets and Ferrimagnets

Abstract

Antiferromagnets and ferrimagnets have negligible net magnetization. Yet, microscopic magnetic moments on each magnetic sublattice can exhibit their dynamic modes as a small fluctuation of the net magnetization. Control and investigation of them has been limited by technical difficulty dealing with a very high frequency and small signals. However, recent experimental efforts reveal intriguing aspects of the antiferro- and ferri- magnetic dynamics. Here, we show our recent experiments of magnetization dynamics in antiferromagnets and ferrimagnets and their unique properties.