Modern Soft Magnets: Amorphous and Nanocrystalline Materials
Modern Soft Magnets: Amorphous and Nanocrystalline Materials
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DOI：
10.1002/chin.201314220
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发表时间：
2013-02
期刊：
影响因子：
--
通讯作者：
G. Herzer
中科院分区：
文献类型：
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作者：
G. Herzer
摘要本文综述了非晶和纳米晶软磁合金的应用。这两种材料有很多共同点，从生产技术开始，包括决定其性能的关键因素。因此，磁晶各向异性在比畴壁宽度小得多的尺度上随机波动，并且因此通过交换相互作用而平均化，使得在磁化过程上没有净各向异性效应，这是良好软磁行为的先决条件。上级软磁性能还需要低磁致伸缩，这对于非晶Co基合金和最近的纳米晶Fe基合金是真实的，但是具有显著更高的饱和感应和更好的热稳定性。这两种材料都显示出高达几百千赫的低损耗，并且可以根据应用需求通过磁场退火来定制它们的B-H环。
Abstract This article surveys amorphous and nanocrystalline alloys for soft magnetic applications. Both materials have much in common, starting from the technique of production and including the key factors that determine their properties. Thus the magneto-crystalline anisotropy randomly fluctuates on a scale much smaller than the domain wall width and, as a consequence, is averaged out by exchange interactions so that there is no net anisotropy effect on the magnetization process, the prerequisite for good soft magnetic behaviour. Superior soft magnetic properties additionally require low magnetostriction, which is true of amorphous Co-based alloys and, more recently, nanocrystalline Fe-based alloys, but at a significantly higher saturation induction and with better thermal stability. Both materials reveal low losses of up to several hundred kilohertz and their B–H loop can be tailored by magnetic field annealing according to the demands of the application.