Abstract
A photothermal deflection based system was applied to measure the small amount of heat released. Specially, the samples as the heat source were different from general photothermal deflection in the photoelectron semiconductor measurement. In this study, we manipulated the thermal deflection method to measure the energy loss of magnetic microstructures including Fe3O4 nanoparticles and sine wave patterned NiFe wire arrays under alternating magnetic field. The experimental result were shown that the energy loss was significantly higher if the easy anisotropy axes of Fe3O4 particles were oriented along the direction of the alternating magnetic field than when the easy anisotropy axes of Fe3O4 particles were perpendicular to the direction of the alternating magnetic field. The study showed it also had the maximum hysteresis loop area when the easy anisotropy axes of Fe3O4 particles were oriented along the direction of the alternating magnetic field. In addition, there is an obvious the energy loss of different domain structures in sine wave patterned NiFe wire array under alternating magnetic field are different. Therefore the energy loss was larger if the alternating magnetic field along the direction of waves accompanied the domain well movement.