Magnetic properties of superparamagnetic particles by a Monte Carlo method
Magnetic properties of superparamagnetic particles by a Monte Carlo method
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DOI：
10.1103/physrevb.54.9237
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发表时间：
1996-10-01
影响因子：
3.7
通讯作者：
Wysin, GM
中科院分区：
文献类型：
--
作者：
Dimitrov, DA;Wysin, GM
我们开发并进行蒙特卡罗模拟的合奏超顺磁性粒子均匀分布在一个矩阵的超顺磁性粒子。我们发现当它表现出磁滞时，磁化强度低于阻断温度T-B，而在超顺磁区，磁化强度高于T-B。我们确定了一组各向异性强度从磁化和磁化率的颗粒的阻断温度。一个固定数量的Monte Carlo步骤与约束的接受率被证明是相当于一个观察时间的模拟，这是远远短于实验观察时间。我们展示了如何在模拟中获得的阻塞温度可以转换成相应的实验测量的阻塞温度，通过使用这种差异的观察时间。这提供了一种方法来比较Monte Carlo模拟结果与实验，如最近的fcc Co粒子。
We develop and carry out Monte Carlo simulations for an ensemble of superparamagnetic particles uniformly distributed in a nonmagnetic matrix. We find the magnetization below the blocking temperature T-B when it shows hysteresis and above T-B in the superparamagnetic region. We determine the blocking temperature for a set of anisotropy strengths from the magnetization and the susceptibility of the particles. A fixed number of Monte Carlo steps with a constrained acceptance rate is shown to be equivalent to an observation time in the simulations that is much shorter than experimental observation times. We show how the blocking temperature obtained in the simulations can be converted into the corresponding experimentally measurable blocking temperature by using this difference in the observation times. This provides a method to compare Monte Carlo simulation results with experiments, such as recent ones on fcc Co particles.