Determination of the critical interspacing for the noninteracting magnetic nanoparticle system

Determination of the critical interspacing for the noninteracting magnetic nanoparticle system
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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
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发表时间:
2011-04-11
影响因子:
4
通讯作者:
Li, L. F.
Li, L. F.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yang, H. T.;Liu, H. L.;Li, L. F.

文献摘要

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单分散Fe(3)O(4)纳米颗粒(NPs)的偶极-偶极相互作用可以通过具有不同厚度的均匀SiO(2)壳直接控制,即,不同的间隔。因此,通过将交流电场下的阻断温度T_B拟合到Vogel-Fulcher定律,可以揭示一系列Fe(3)O(4)-SiO(2)NPs体系的相互作用强度。对于小于8.0 nm的Fe(3)O(4)纳米粒子,间距大于直径的5倍是实现非相互作用的临界值。此外,用蒙特卡罗方法计算了不同尺寸和饱和磁化强度的非相互作用磁性纳米粒子系统临界间距的一般公式。(C)2011年美国物理学会。[doi 10.1063/1.3574917]
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]