相互作用磁性粒子组合体中的位形相关退磁场
Configuration dependent demagnetizing field in assemblies of interacting magnetic particles
摘要：
本文提出了一种平均场模型，用于描述任意形状的交换解耦磁性粒子组装体中与结构相关的有效退磁场和各向异性场，该模型用粒子的退磁场因子和包含组装体的体积形状来表示。已被认为是permanently磁化的2D组件，它示出的退磁场是低于连续的薄膜。作为这些2D系统的一个例子，圆柱形纳米线阵列的特征在于剩磁曲线以及铁磁共振，这有助于显示这些测量与模型的对应关系，并验证平均场方法。线性链的圆柱体和球体进行了分析，导致简单的表达式来描述易轴旋转引起的相互作用场在链的低纵横比圆柱形颗粒，和偶极磁各向异性观察到的线性链的球体。这些例子用来强调偶极相互作用场和有效退磁因子对外部体积形状所产生的贡献的依赖性。
英文摘要：
A mean field model is presented for the configuration dependent effective demagnetizing and anisotropy fields in assemblies of exchange decoupled magnetic particles of arbitrary shape which are expressed in terms of the demagnetizing factors of the particles and the volumetric shape containing the assembly. Perpendicularly magnetized 2D assemblies have been considered, for which it is shown that the demagnetizing field is lower than the continuous thin film. As an example of these 2D systems, arrays of bistable cylindrical nanowires have been characterized by remanence curves as well as ferromagnetic resonance, which have served to show the correspondence of these measurements with the model and also to validate the mean field approach. Linear chains of cylinders and spheres have been analyzed leading to simple expressions to describe the easy axis rotation induced by the interaction field in chains of low aspect ratio cylindrical particles, and the dipolar magnetic anisotropy observed in the linear chain of spheres. These examples serve to underline the dependence on the dipolar interaction field and effective demagnetizing factor on the contributions that arise from the shape of the outer volume.
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