Determination of the critical interspacing for the noninteracting magnetic nanoparticle system
Determination of the critical interspacing for the noninteracting magnetic nanoparticle system
复制标题
非相互作用磁性纳米颗粒系统临界间距的确定
DOI:
10.1063/1.3574917
复制
发表时间:
2011-04-11
影响因子:
4
通讯作者:
Li, L. F.
中科院分区:
文献类型:
--
作者:
Yang, H. T.;Liu, H. L.;Li, L. F.
The dipole-dipole interactions of monodisperse Fe(3)O(4) nanoparticles (NPs) can be directly controlled by a uniform SiO(2) shell with different thickness, i.e., different interspacings. Thus, the interacting strength of a serial of Fe(3)O(4)-SiO(2) NPs system can be revealed by fitting the blocking temperature TB measured at ac fields to the Vogel-Fulcher law. The interspacing over five times of diameter for less than 8.0 nm Fe(3)O(4) NPs is the critical value to achieve a noninteracting system. Furthermore, a general equation to evaluate critical interspacing for noninteracting magnetic NPs systems with different sizes and saturation magnetizations was calculated by Monte Carlo method. (C) 2011 American Institute of Physics. [doi:10.1063/1.3574917]