Observation of gyromagnetic reversal

Abstract

We report direct observation of gyromagnetic reversal, which is the sign change of gyromagnetic ratio in a ferrimagnet Ho${}_3$Fe${}_5$O${}_{12}$, by using the Barnett effect measurement technique at low temperatures. The Barnett effect is a phenomenon in which magnetization is induced by mechanical rotation through the coupling between rotation and total angular momentum $J$ of electrons. The magnetization of Ho${}_3$Fe${}_5$O${}_{12}$ induced by mechanical rotation disappears at 135~K and 240~K. The temperatures correspond to the magnetization compensation temperature $T_{\mathrm{M}}$ and the angular momentum compensation temperature $T_{\mathrm{A}}$, respectively. Between $T_{\mathrm{M}}$ and $T_{\mathrm{A}}$, the magnetization flips over to be parallel against the angular momentum due to the sign change of gyromagnetic ratio. This study provides an unprecedented technique to explore the gyromagnetic properties.

arXiv comment4pages,4figures

References in corpus (1)

• Fast domain wall motion induced by antiferromagnetic spin dynamics at the angular momentum compensation temperature of ferrimagnets

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