Department of Electrical and Computer Engineering, Yokohama National University, Yokohama 240-8501, Japan.
Department of Materials Engineering, Yokohama National University, Yokohama 240-8501, Japan.
Molecules. 2020 Jul 19;25(14):3282. doi: 10.3390/molecules25143282.
In this study, we evaluated the magnetization properties of a magnetic alloy with single-crystalline cubic nanostructures, in order to clarify its magnetocrystalline anisotropy. Upon applying a specific annealing treatment to the CuNiFe base material, the precipitated magnetic particles grew into cubic granules, resulting in the formation of nanometric cubic single crystals of magnetic CuNiFe in a nonmagnetic Cu-rich matrix. The cubic nanostructures of CuNiFe were oriented along their crystallographic axis, in the <100> direction of the face-centered-cubic structure. We evaluated the static magnetization properties of the sample, which originated primarily from the CuNiFe nanocubes precipitated in the Cu-rich matrix, under an applied DC magnetic field. The magnetocrystalline anisotropy was readily observed in the magnetization curves. The <111> axis of the CuNiFe was observed to be the easy axis of magnetization. We also investigated the dynamic magnetization properties of the sample under an AC magnetic field. By subtracting the magnetic signal induced by the eddy current from the magnetization curves of the sample, we could obtain the intrinsic AC magnetization properties of the CuNiFe nanocubes.
在这项研究中，我们评估了具有单晶立方纳米结构的磁性合金的磁化特性，以阐明其磁各向异性。通过对 CuNiFe 基体施加特定的退火处理，析出的磁性颗粒生长成立方颗粒，从而在富 Cu 的非磁性基体中形成纳米级立方单晶磁性 CuNiFe。CuNiFe 的立方纳米结构沿其晶轴，即面心立方结构的<100>方向取向。我们评估了在直流磁场下，主要来源于富 Cu 基体中析出的 CuNiFe 纳米立方的样品的静态磁化特性。在磁化曲线中很容易观察到磁各向异性。观察到 CuNiFe 的<111>轴是易磁化轴。我们还研究了样品在交流磁场下的动态磁化特性。通过从样品的磁化曲线中减去涡流引起的磁信号，我们可以获得 CuNiFe 纳米立方的固有交流磁化特性。
