Observation of gyromagnetic reversal

Imai, Masaki ; Ogata, Yudai*; Chudo, Hiroyuki ; Ono, Masao ; Harii, Kazuya; Matsuo, Mamoru*; Onuma, Yuichi*; Maekawa, Sadamichi; Saito, Eiji

We report direct observation of gyromagnetic reversal, which is the sign change of gyromagnetic ratio in a ferrimagnet HoFeO $_{12}$ , 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 of electrons. The magnetization of HoFeO $_{12}$ induced by mechanical rotation disappears at 135 K and 240 K. The temperatures correspond to the magnetization compensation temperature $T_{rm M}$ and the angular momentum compensation temperature $T_{rm A}$ , respectively. Between $T_{rm M}$ and $T_{rm A}$ , 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.

Language	:	English
Journal	:	Applied Physics Letters
Volume	:	113
Number	:	5
Pages	:	p.052402_1 - 052402_3
Publication Year/Month	:	2018/07
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Paper URL	:	https://doi.org/10.1063/1.5041464
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	バーネット効果; 角運動量補償; フェリ磁性
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Press Release	:	高速回転で探る磁石中の電子の回転運動の消失; 回転運動の消失による高速磁気デバイスの材料探索に道を拓く
Article of JAEA R&D Review	:	Detection of the Singularity of Magnets Using Rotation; Measuring the Angular Momentum Compensation, Key to Speeding Up Magnetic Devices[/]
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Registration No. : AA20180213
JAEA Abstracts No. : 46000728
Paper Submission No. : 20306

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