Layering Phenomena Driven by Rotating Magnetic Field in Ferrofluid

Magnetic fluid is a compound material of colloidal liquid, consisting of a base suspension liquid, nano sized magnetic particles such as Co‐ferrite or Ba‐ferrite which have their own magnetic moment, and surfactant.In order to calculate the microstructure formation process of magnetic fluid, we use the Langevin‐type microscopic equation of motion and perform the molecular dynamics simulation. In the study, we investigate physical force originated by the magnetic and surrounding fluid flow and torque.We consider the rotating field effect, and obtain layering structures in various ranges of the rotating frequency and packing density. These structures are found in ER and MR fluid, however, not yet found in MF.