Effect of static magnetic field bias on dynamic hysteresis loops of a magnetic nanoparticle suspension

Herein, dynamic hysteresis loops of Fe3O4 suspension were investigated at different amplitudes of AC magnetic field (AMF) with simultaneously applied parallel DC magnetic fields (DC-MF). Consequently, the dynamic magnetization induced by a small AMF showed approximately the same gradient as that of thermal equilibrium magnetization at large DC-MF. However, the slope of the dynamic magnetization was smaller than that of thermal equilibrium value at small DC-MF. At large AMF, the addition of DC-MF caused simple shifts in the MH curves. The dynamic loop area, which is considered to be equal to the heating ability, decreased at small DC-MF and dampened the heat generation characteristics. At large AMF amplitudes, the reduction in the loop area due to the application of DC-MF was suppressed.

Automated summary

This study investigated the dynamic hysteresis loops of Fe3O4 suspension under different amplitudes of AC magnetic field (AMF) and simultaneously applied parallel DC magnetic fields (DC-MF). The results showed that the dynamic magnetization induced by a small AMF had a similar gradient to the thermal equilibrium magnetization at a large DC-MF, but with a smaller slope. At large amplitudes of AMF, the addition of DC-MF only caused simple shifts in the hysteresis curves. The reduction in the loop area due to the application of DC-MF was suppressed at high AMF amplitudes.