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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 $$T_{rm A}$$.

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Category:Physics, Multidisciplinary

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