Dynamics of magnetic single domain particles embedded in a viscous liquid

摘要: Kinetic equations for magnetic nano particles dispersed in a viscous liquid are developed and analyzed numerically. Depending on the amplitude of an applied oscillatory field orient their time averaged anisotropy axis perpendicular to low amplitudes nearly parallel direction high amplitudes. The transition between these regions takes place narrow interval. In region moment is locked some crystal energy absorption driving dominated by losses associated with particle rotation liquid. opposite limit rotates within while its easy being external oscillates. kinetic generalized include thermal fluctuations. This leads significant increase power intermediate pronounced peak as function size. region, other hand, inclusion fluctuations reduces absorption. illustrative numerical calculations presented performed parameters typical iron oxide.