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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Microwave power absorption analysis in the devitrification process of Co-based amorphous ribbons
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Microwave power absorption analysis in the devitrification process of Co-based amorphous ribbons

机译：钴基非晶带材失透过程中的微波吸收分析

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摘要

Melt-spun Co66Fe4B12Si13Nb4Cu soft magnetic ribbons were devitrified at low annealing temperatures (623 K), for times 5-20 min. Microwave power absorption measurements at 9.4 GHz (X-band) were carried out in two geometries. In geometry 1, the ribbon's plane was oriented parallel to AC magnetic field. For the orientation 2, the ribbon's plane was normal to the AC magnetic field. In both cases, the ribbon's axis was parallel to the DC magnetic field. For both orientations, two absorptions were observed: the first corresponds to a low field microwave absorption (LFA) centered in zero dc magnetic field, and a higher field absorption corresponding to the ferromagnetic resonance (FMR). In the geometry 1, a single FMR spectrum was observed for all the samples, with a shift in resonant field as annealing increased. For geometry 2, evidence of the superposition of two FMR signals was observed. FMR spectra are therefore due to a combination of two different magnetic phases corresponding to the amorphous matrix and nanocrystallites. Deconvolution calculations were carried out on FMR spectra to separate the contributions. Their behavior as a function of annealing time was in good agreement with the magnetic softening, also obtained with LFA results. The differences in microwave absorption, for both geometries, can be explained by differences in the electromagnetic wave propagation volume.
机译：将熔融纺制的Co66Fe4B12Si13Nb4Cu软磁性薄带在较低的退火温度（623 K）下失透5-20分钟。在两种几何结构中进行了9.4 GHz（X波段）的微波功率吸收测量。在几何1中，带的平面定向为平行于AC磁场。对于方向2，碳带的平面垂直于AC磁场。在这两种情况下，碳带的轴都平行于直流磁场。对于两个方向，都观察到两个吸收：第一个吸收对应于以零直流磁场为中心的低场微波吸收（LFA），而对应于铁磁共振（FMR）的更高吸收。在几何1中，所有样品均观察到一个FMR光谱，随着退火的增加，共振场发生变化。对于几何2，观察到两个FMR信号叠加的证据。因此，FMR光谱归因于对应于非晶基质和纳米微晶的两种不同磁相的组合。对FMR谱图进行反卷积计算以分离影响。它们的行为作为退火时间的函数与磁性软化也很好地吻合，LFA结果也获得了它们。对于两种几何形状，微波吸收的差异可以通过电磁波传播量的差异来解释。

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