Magnetic properties of metallic ferromagnetic nanoparticle composites
Magnetic properties of metallic ferromagnetic nanoparticle composites
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DOI：
10.1063/1.1759073
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发表时间：
2004-07-01
影响因子：
3.2
通讯作者：
Renaud, P
中科院分区：
文献类型：
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作者：
Ramprasad, R;Zurcher, P;Renaud, P
纳米颗粒复合材料，包括嵌入在一个有序矩阵的铁磁纳米颗粒的排列，已确定使用基于唯象方法的模型的磁性。该模型的输入材料参数包括饱和磁化强度（M-s）、晶体各向异性场（H-k）、描述颗粒中磁损耗的阻尼参数（alpha）以及颗粒的电导率（sigma）;假设所有颗粒具有相同的特性。为了实现最佳的磁性能（例如，磁导率）。在何种程度上的物理属性需要被控制已被确定通过分析的铁磁共振（FMR）和涡流损耗在不同的颗粒体积分数。具有半径小于100 nm的近似球形颗粒（对于此处选择的材料参数）的复合材料，被填充以实现薄膜几何形状（所有颗粒的易磁化轴彼此平行并平行于薄膜表面对齐），预期具有低涡电流损耗，以及最佳磁导率和FMR行为。(C)2004年，美国物理学会。
Magnetic properties of nanoparticle composites, consisting of aligned ferromagnetic nanoparticles embedded in a nonmagnetic matrix, have been determined using a model based on phenomenological approaches. Input materials parameters for this model include the saturation magnetization (M-s), the crystal anisotropy field (H-k), a damping parameter (alpha) that describes the magnetic losses in the particles, and the conductivity (sigma) of the particles; all particles are assumed to have identical properties. Control of the physical characteristics of the composite system-such as the particle size, shape, volume fraction, and orientation-is necessary in order to achieve optimal magnetic properties (e.g., the magnetic permeability) at GHz frequencies. The degree to which the physical attributes need to be controlled has been determined by analysis of the ferromagnetic resonance (FMR) and eddy current losses at varying particle volume fractions. Composites with approximately spherical particles with radii smaller than 100 nm (for the materials parameters chosen here), packed to achieve a thin film geometry (with the easy magnetization axes of all particles aligned parallel to each other and to the surface of the thin film) are expected to have low eddy current losses, and optimal magnetic permeability and FMR behavior. (C) 2004 American Institute of Physics.