论文标题
旋转场中各向异性顺磁颗粒的链长
The chain length of anisotropic paramagnetic particles in a rotating field
论文作者
论文摘要
在本文中，研究了在旋转磁场中具有磁各向异性的顺磁性颗粒链的最大长度。顺磁性颗粒链的理论通常假设颗粒在磁性上是各向同性的，并且不会在旋转场中旋转。在实验中，可以看到球形磁磁颗粒旋转，可以用小磁各向异性来解释。在本文中，计算出旋转磁场中具有磁各向异性的顺磁性颗粒的最大链长。结果表明，如果场频率比单个粒子的临界频率高得多或低得多，则最大链长作为场频率的函数具有相同的各向同性磁性颗粒和具有磁各向异性的颗粒的趋势。蓝色最初随机分布的颗粒将形成链条，将与粒子碰撞并交换，直到获得典型的链长。小簇的典型链长度比相同场频率的隔离链的最大链长度短。对于具有较高磁性各向异性的颗粒，一小链链中链长的分布较窄。由于链长的分布较窄，具有磁各向异性的颗粒可以更适合大量生产。本文将展示顺磁性颗粒的磁各向异性参数如何影响旋转磁场中形成的链的链长。
In this article, the maximal length of a chain of paramagnetic particles with magnetic anisotropy in a rotating magnetic field is studied. The theory of paramagnetic particle chains usually assumes that the particles are magnetically isotropic and do not rotate in a rotating field. In experiments it is seen that spherical paramagnetic particles rotate, which can be explained by small magnetic anisotropy. In this article, the maximal chain length is calculated for paramagnetic particles with magnetic anisotropy in a rotating magnetic field. Results show that the maximal chain length as a function of field frequency has the same trend for isotropic magnetic particles and particles with magnetic anisotropy if the field frequency is much higher or much lower than the critical frequency of an individual particle. blue Initially randomly distributed particles will form chains that will collide and exchange with particles till they obtain a typical chain length. The typical chain length of a small cluster is shorter than the maximal chain length of an isolated chain for the same field frequency. The distribution of chain lengths in a small cluster of chains is narrower for particles with higher magnetic anisotropy. Due to the narrower distribution of chain lengths, particles with magnetic anisotropy can suit better for mass-production. This article will show how magnetic anisotropy parameters of paramagnetic particles influence chain length of chains which form in a rotating magnetic field.
