In 1967, NASA created a MF viscous damper to suppress the oscillations of a Radio Astronomy Explorer satellite, which was the first successful use of a MF damper in aerospace . Since then, a lot of effort had been devoted to develop the MF damper. In 1978, a viscous-fluid inertia damper based on the levitation characteristics of MFs was proposed and employed to dampen the rotary vibration of stepping motor shafts .