Figure 2.

Thermo-responsive behavior of magnetic nanospheres from DLS measurement. Rh(T) represents the hydrodynamic radius at any temperature T, and Rh(22) represents the radius at 22 °C. Inset: Minor hysteresis loop amplitudes of the nanospheres, revealing loop area dependence (equivalent to power loss) with increasing field intensity

Ghosh et al. Nanoscale Research Letters 2009 5:195-204   doi:10.1007/s11671-009-9465-9