抄録
Field-induced rotation and translation caused by static field below 1T was studied for sub-mm sized diamagnetic particles using a short term μg condition. Magnetic motions of ordinary solid, free of spontaneous moment, has not been reported at such low field before. In a given field distribution, the motions were mainly determined by intrinsic magnetization of the material; they were independent to mass of particle. This was because the motions were induced by magnetic volume force. The above translation is applicable in identifying the μm-sized grains or regolith collected in various regions of the solar system. The magnetic rotation provides quantitative information to solve the mechanism of dust alignment observed in various interstellar regions. The above motions were observable in a short μg duration produced by a compact drop-shaft; here the observation was realized by adopting a small NdFeB magnetic-circuit. The established technique to observe the motions of sub-mm sized sample is a step to detect the magnetic motions of μm & nm grains.
