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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Role of the poly-dispersity and the dipolar interaction in magnetic nanoparticle systems: Monte Carlo study
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Role of the poly-dispersity and the dipolar interaction in magnetic nanoparticle systems: Monte Carlo study

机译：磁性纳米粒子系统中的多分散性和偶极相互作用的作用：蒙特卡罗研究

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摘要

In this paper, roles of the poly-dispersity and the dipolar interaction in frozen ferrofluid are studied by Monte Carlo method. A sample containing the uniaxial anisotropy and the random orientation is used to investigate. The temperature dependence of the coercivity is calculated to consider the magnetic phase transition under the influence of the dipolar interaction. We show that in the poly-dispersity and interacting sample, the temperature dependence of coercive field does not follow the classical expression, H_C/H _A = 0.48[1 - (T/T_B)~(1/2)]. We find that the transition temperature, which separates the anti-ferromagnetic and ferromagnetic states of strongly interacting sample, is not unique and it strongly depends on the variation of concentration. We also discuss about the concentration dependence of the coercivity at the different size distributions. At the finite temperature, the curve expresses a cusp which is due to the competition between the blocking and super-paramagnetic state at the low concentration. Therefore, we can see that the poly-dispersity also contributes to the complexity of magnetic phase of frozen ferrofluids.
机译：本文研究了蒙特卡罗法研究了冷冻铁磁流中的多分散性和双极相互作用的作用。含有单轴各向异性和随机取向的样品用于研究。计算矫顽力的温度依赖性，以考虑在偶极相互作用的影响下的磁相转变。我们表明，在多分散性和相互作用样品中，矫顽场的温度依赖性不遵循经典表达，H_C / H _A = 0.48 [1 - （T / T_B）〜（1/2）]。我们发现将抗铁磁和铁磁性强烈相互作用的过渡温度的过渡温度不是独特的，并且它强烈取决于浓度的变化。我们还讨论了在不同尺寸分布下矫顽力的浓度依赖性。在有限温度下，曲线表达了一个尖端，这是由于延长浓度的阻塞和超级顺态之间的竞争。因此，我们可以看出，聚分散性也有助于冷冻铁物质流体的磁相的复杂性。

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