Magnetic moment and volume fraction controlling chain-like structures of magnetic nanoparticles in uniform magnetic fields

摘要

The magnetically assembled chain-like structures of magnetic nanoparticles attract great attention due to their unique properties. In this paper, we studied the influences of essential magnetic controlling parameters on the chain-like structures of magnetic nanoparticles with diameter d = 360 nm using a 3D Monte Carlo simulation. The magnetic moment and volume fraction of magnetic nanoparticles were found to play crucial roles in the arrangement of the nanoparticles. The simulation results were in agreement with experimental evidence, summarized as follows: In the limit of low magnetic moment m 1.5x10(-15) A.m(2) and volume fraction phi 7.3x10(-15) A.m(2) and volume fraction phi >1, nanochains gradually coarsened into the nanobundles with increasing volume fraction. The results can provide a theoretical basis to construct and regulate other assembled structures consisting of building blocks.