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Interplay between the magnetic field and the dipolar interaction on a magnetic nanoparticle system: A Monte Carlo study

机译:磁场和磁性纳米粒子系统上的偶极相互作用之间的相互作用:蒙特卡洛研究

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摘要

We have studied the influence of the applied magnetic field on the blocking temperature (TB) of a fine magnetic particle system. By means of a Monte Carlo technique we have simulated zero field cooling (ZFC) curves under different applied fields, obtaining the respective TB as a function of H. We have focused our study on the limit H -> H-K (where H-K is the anisotropy field), since the results found in the literature usually lack a detailed study of this range. The simulations were done at different sample concentration of the nanoparticles, with the purpose of observing how the magnetic dipolar interaction affects the field dependence of TB. The classical expression predicts TB to disappear for H >= H-K, independently of the dipolar interaction strength. Our simulations show that at strong interacting conditions TB exists even for fields H > H-K.
机译:我们已经研究了施加的磁场对细磁粉系统的阻挡温度(TB)的影响。通过蒙特卡洛技术,我们模拟了不同应用场下的零场冷却(ZFC)曲线,获得了相应的TB作为H的函数。我们将研究重点放在了极限H-> HK上(其中HK是各向异性)领域),因为文献中的结果通常缺乏对该范围的详细研究。为了观察磁偶极相互作用如何影响结核病的磁场依赖性,在纳米粒子的不同样品浓度下进行了模拟。经典表达式预测,当H> = H-K时,TB会消失,而与偶极相互作用强度无关。我们的模拟表明,在强相互作用条件下,即使对于场> H-K,也存在TB。

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