超顺磁性纳米微粒(superparamagnetic nanoparticles,NPs)是铁磁材料的一类。在没有外加磁场的情况下,由于每个原子保持其相对有序状态,在快速变换磁性状态的过程中没有剩磁,因此,整体的NPs的磁矩不会随着热能的变化自由波动;在外加磁场作用下NPs有一个饱和磁化强度,受到热能波动的影 Superparamagnetic nanoparticles (superparamagnetic nanoparticles, NPs) is a class of ferromagnetic materials. In the absence of an applied magnetic field, the magnetic moment of the overall NPs does not fluctuate freely with the change of thermal energy because each atom maintains its relatively ordered state without residual magnetism during the rapid change of the magnetic state. In the absence of an applied magnetic field, Under the action of an external magnetic field, NPs have a saturation magnetization, which is affected by the fluctuation of thermal energy