Year: 2018
Type: article
Abstract: 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.
Source: Applied Physics Letters
DOI: 10.1063/1.5041464
Authors: Masaki Imai, Yudai Ogata, Hiroyuki Chudo, Masao Ono, Kazuya Harii, Mamoru Matsuo, Yuichi Ohnuma, Sadamichi Maekawa, Eiji Saitoh
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Development of a high-frequency induction heating using mechanical rotation for centrifugation at high temperature, Research for fluid flow driven by spin current injection, G4518579276, G5475408225, In situ observation of the isotope centrifugal separation in the liquid state using nuclear magnetic resonance, Angular momentum conversion among spin and mechanical motion, G7382943966, G7627573086, Coupling between spin and mechanical rotation in spintronics
OpenAlex ID: W2804884072