Barnett effect in rare-earth metals

Ogata, Yudai; Chudo, Hiroyuki ; Ono, Masao  ; Harii, Kazuya; Matsuo, Mamoru; Ieda, Junichi   ; Okayasu, Satoru  ; Maekawa, Sadamichi; Saito, Eiji

The magnetomechanical factor g of Gd, Tb, and Dy metals were determined by measurements of the Barnett effect using homemade apparatus, which consists of fluxgate sensor, magnetic shield, and high speed rotar. We performed mechanical rotation experiments up to 1.5 kHz at room temperature. The emergent magnetic field (Barnett field) in sample caused by mechanical rotation linearly depends on the rotational frequency. The gfactor of Gd, Tb, and Dy samples were estimated to be 2.000.08, 1.530.17, and 1.150.32, respectively, from the slopes of the rotation dependence of the Barnett field. This study provides a new technique for determination of the g factor even under zero magnetic field.