To develop the biomedical applications using magnetic nanoparticles, the evaluation of magnetization dynamics associated with magnetic relaxation is important. The easy axes of magnetic nanoparticles were rotated due to magnetic torque in liquid as the physical rotation. In this study, we experimentally evaluated the physical rotation and alignment of the easy axes in a viscous liquid by preparing samples in which the orientation of the easy axes was fixed in an alternating magnetic field at each frequency. The magnetization dynamics influenced by the rotation and alignment of the easy axes were assessed by measurements and numerical simulations.
NETL
