Gyroscopic factor of rare earth metals

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

We develop the magnetization measurement apparatus for observing the Barnett effect consisting of a fluxgate sensor, high speed rotor with frequencies of up to 1.5 kHz, and magnetic shield at room temperature. The effective magnetic field (Barnett field) in a sample arising from rotation magnetizes the sample and is proportional to the rotational frequency. The gyroscopic factor, , of rare earth metals, in particular, Gd, Tb and Dy 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 technique to determine the factor even in samples where the spectroscopic method may not be available.