水平非一様交流磁場によって励起される磁性流体界面の波動

抄録

The surface waves of a magnetic fluid under a horizontal non-uniform alternating magnetic field is investigated experimentally and analytically. While the frequency of the wave on a magnetic fluid is usually the same as that of the applied magnetic field, in the case of the iron nitride magnetic fluid, which is newly developed and has very high susceptibility and magnetization, the frequency of the wave is twice that of the applied magnetic field. This is confirmed by the linear stability theory. The shape of the surface, the motion inside of the fluid and the disturbed magnetic field are presented.