Surface crystallization and magnetic properties of amorphous Fe80B20 alloy
Surface crystallization and magnetic properties of amorphous Fe80B20 alloy
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非晶Fe80B20合金的表面结晶及磁性能
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
E. Puppin
中科院分区：
文献类型：
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作者：
P. Vavassori;F. Ronconi;E. Puppin
研究了Fe_（80）B_（20）非晶合金表面晶化对磁性能的影响。用磁光克尔法测量了样品的表面磁性，用振动样品磁强计测量了样品的体相磁性。这项研究表明，表面结晶是类似的体过程，但发生在较低的温度。与以前的其他铁基非晶合金的结果不同，表面结晶层不会引起体磁硬化。此外，剩磁饱和比和体磁各向异性没有表现出明显的变化后，表面结晶层的形成。表面层的居里温度相对于样品的本体较低。这些效果可以解释为在铸态非晶合金的表面区域中的较低硼浓度。化学成分的测量证实了表面区域中硼浓度的降低。
We have studied the effects of surface crystallization on the magnetic properties of Fe80B20 amorphous alloys. The surface magnetic properties have been studied with magneto-optic Kerr measurements, while those of bulk with a vibrating sample magnetometer. This study reveals that surface crystallization is similar to the bulk process but occurs at a lower temperature. At variance with previous results on other iron-based amorphous alloys the surface crystalline layer does not induce bulk magnetic hardening. Furthermore, both the remanence to saturation ratio and the bulk magnetic anisotropy do not show appreciable variations after the formation of the surface crystalline layer. The Curie temperature of the surface layer is lower with respect to the bulk of the sample. These effects can be explained by a lower boron concentration in the surface region of the as-cast amorphous alloy. Measurements of the chemical composition confirm a reduction of boron concentration in the surface region.