Magnetic properties of film-form assembly of α-Fe nanoparticles with strong interparticle dipolar interaction

摘要

Many studies reported that concentrated magnetic nanoparticle (NP) assemblies show collective ordering induced by interparticle interaction. A magnetic NP assembly, with sufficiently strong dipolar interaction, can show spin-glass-like behavior which is called superspin glass (SSG). Recent reports show that some NP systems have a magnetic phase with ferromagnetic correlation between particle magnetic moments which is called super ferromagnetism (SFM).