Magnetic properties of self-assembled nanostructure films on the base of amorphous Ni granules

摘要: Abstract We report on structural and magnetic properties of granular films consisting 2.5 nm Ni nanoparticles. The are fabricated by the original laser electrodispersion technique, which allows producing nearly monodisperse amorphous particles. Atomic force microscopy (AFM) study shows that in 8 nm thickness particles self-assembled clusters with lateral size 100–150 nm height about 8 nm. Performed SQUID, magnetization measurements reveal superparamagnetic behaviour, characteristic for an ensemble non-interacting single domain particulates. It is found moment particulate equal to 3000 individual nanoparticles blocking temperature close room temperature. Defined from measurements, particulates correlates well determined AFM images. propose exchange interaction plays important role formation aligning moments inside clusters. Presence high makes potentially useful high-density data storage applications.