Observation of the angular momentum compensation by Barnett effect and NMR

Chudo, Hiroyuki ; Imai, Masaki ; Matsuo, Mamoru; Maekawa, Sadamichi; Saito, Eiji

We demonstrate observation of the angular momentum compensation temperature $T_{rm A}$ , at which the net angular momentum is quenched in ferrimagnets. Using the Barnett effect, in which an object is magnetized by mechanical rotation owing to spin-rotation coupling, we measure $T_{rm A}$ in the Ho $_{3-x}$ Dy $_{x}$ Fe $_{5}$ O $_{12}$ system. We determine $T_{rm A}$ to be 240 K in Ho $_{3}$ Fe $_{5}$ O $_{12}$ (HoIG). We find that $T_{rm A}$ increases with Dy content and show that $T_{rm A}$ of Ho $_{1.5}$ Dy $_{1.5}$ Fe $_{5}$ O $_{12}$ corresponds with room temperature. We also demonstrate that $^{57}$ Fe-NMR measurements can be applied to explore domain wall dynamics in HoIG. We find that the NMR intensity exhibits a maximum at $T_{rm A}$ in the multi-domain state. We provide a simple model for describing this NMR signal enhancement caused by enhancement of domain-wall mobility at $T_{rm A}$ .

Language	:	English
Journal	:	Journal of the Physical Society of Japan
Volume	:	90
Number	:	8
Pages	:	p.081003_1 - 081003_11
Publication Year/Month	:	2021/08
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Paper URL	:	https://doi.org/10.7566/JPSJ.90.081003
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Registration No. : AA20210169
JAEA Abstracts No. : 50000046
Paper Submission No. : 24866

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