We report direct observation of gyromagnetic reversal, which is the sign change of the gyromagnetic ratio in a ferrimagnet insulator Ho3Fe5O12, 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 Ho3Fe5O12 induced by mechanical rotation disappears at 135 K and 240 K. The temperatures correspond to the magnetization compensation temperature TM and the angular momentum compensation temperature TA, respectively. Between TM and TA, the magnetization flips over to be parallel against the angular momentum due to the sign change of the gyromagnetic ratio. This study provides an unprecedented technique to explore the gyromagnetic properties.
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30 July 2018
Research Article|
August 02 2018
Observation of gyromagnetic reversal
Masaki Imai;
Masaki Imai
a)
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
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Yudai Ogata
;
Yudai Ogata
a)
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
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Hiroyuki Chudo;
Hiroyuki Chudo
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
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Masao Ono;
Masao Ono
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
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Kazuya Harii;
Kazuya Harii
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
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Mamoru Matsuo;
Mamoru Matsuo
2
Advanced Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
3
Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
4
Riken Center for Emergent Matter Science (CEMS)
, Wako 351-0198, Japan
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Yuichi Ohnuma;
Yuichi Ohnuma
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
3
Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
4
Riken Center for Emergent Matter Science (CEMS)
, Wako 351-0198, Japan
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Sadamichi Maekawa;
Sadamichi Maekawa
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
3
Kavli Institute for Theoretical Sciences, University of Chinese Academy of Sciences
, Beijing 100190, People's Republic of China
4
Riken Center for Emergent Matter Science (CEMS)
, Wako 351-0198, Japan
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Eiji Saitoh
Eiji Saitoh
1
Advanced Science Research Center, Japan Atomic Energy Agency
, Tokai 319-1195, Japan
2
Advanced Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
5
Institute for Materials Research, Tohoku University
, Sendai 980-8577, Japan
6
Department of Applied Physics, The University of Tokyo
, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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a)
M. Imai and Y. Ogata contributed equally to this work.
Appl. Phys. Lett. 113, 052402 (2018)
Article history
Received:
May 24 2018
Accepted:
July 19 2018
Citation
Masaki Imai, Yudai Ogata, Hiroyuki Chudo, Masao Ono, Kazuya Harii, Mamoru Matsuo, Yuichi Ohnuma, Sadamichi Maekawa, Eiji Saitoh; Observation of gyromagnetic reversal. Appl. Phys. Lett. 30 July 2018; 113 (5): 052402. https://doi.org/10.1063/1.5041464
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