Extension of the effective medium approximation for determination of the permeability tensor of unsaturated polycrystalline ferrites
Extension of the effective medium approximation for determination of the permeability tensor of unsaturated polycrystalline ferrites
复制标题
用于确定不饱和多晶铁氧体磁导率张量的有效介质近似的扩展
DOI：
10.1109/20.966123
复制
发表时间：
2001
影响因子：
2.1
通讯作者：
M. L. Floc'h
中科院分区：
文献类型：
--
作者：
D. Bariou;P. Quéffélec;P. Gelin;M. L. Floc'h
本文提出了多晶铁氧体在磁饱和以下特性的物理模型，这是铁氧体在微波器件中的许多应用中的常见条件。这些特性主要通过有效磁导率张量的元素来表征，作为磁化状态、各向异性场和频率的函数。部分磁化状态的特征在于磁畴在方向上的适当分布。研究的磁畴形状是圆柱体和球体。介质的均匀性是在有效介质近似中获得的，这使我们能够将异质磁性材料视为材料中存在的非磁性物质的体积分数的函数。该模型在单个计算阶段给出渗透率张量的所有分量。本文提出了剩磁（未施加外场）下不同部分磁化状态的结果，并将其与磁导率张量分量的经验公式在其有效性范围内进行了比较。
This paper presents a physical model of the properties of polycrystalline ferrites below magnetic saturation, a common condition in many applications of ferrites in microwave devices. The properties are mainly characterized through the elements of the effective permeability tensor as functions of magnetization state, anisotropy field, and frequency. Partially magnetized states are characterized by a suitable distribution of magnetic domains over orientations. The magnetic domain shapes studied were cylinders and spheres. Homogeneity of the medium is obtained in the effective medium approximation, which allows us to treat heterogeneous magnetic materials as a function of the volume fraction of nonmagnetic matter present in the material. The model gives all the components of the permeability tensor in a single calculation phase. The paper presents results for different partially magnetized states at remanence (with no external field applied) and compares them with empirical formulations of permeability tensor components, in their domain of validity.