Abstract
The science of phenomenon that a material changes its viscoelasticity when subjected to a magnetic field is called Magneto-Rheology (MR), and the function is called the MR effect. The typical material is an MR fluid containing micronsized ferromagnetic particles dispersed in an oil. In addition to the MR fluid, this review article also covers a high-fluidity dry MR fluid consisting of oil-free ferromagnetic particles powder with higher MR effect and higher environmental resistance, and an MR elastomer consisting of ferromagnetic fine particles dispersed in a silicone rubber and cured. The advanced MR technologies ranging from the fabrication and MR effect evaluation of various functional fluids and soft materials showing the MR effects to the application technologies to various devices and systems have been discussed by mainly introducing the author's research and development cases.
