A large change is observed in the magnetic properties of amorphous Fe–Zr thin films sputtered at different Ar pressures. The change depends on the composition of the alloys and at compositions near 60 at.% Fe, for example, the magnetisation measured at 10 kOe increases 30-fold with an increase in the Ar pressure from 2 to 10 mTorr. The magnetic properties are well explained by a combination of two phenomena—superparamagnetism and spin glass behaviours—and the large change is partly related to the number density of a magnetically correlated region. Examinations of the microstructure by X-ray diffraction, transmission electron microscopy, and X-ray absorption fine structure spectroscopy reveal no appreciable difference in it as a function of the Ar pressure. This indicates that even a very slight change in the microstructure can greatly affect the magnetic properties of amorphous Fe–Zr thin films, thereby opening up the possibility of employing the magnetic properties of amorphous alloys for the characterisation of amorphous microstructures.
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机译：观察到在不同的Ar压力下溅射的非晶Fe-Zr薄膜的磁性能发生了很大的变化。这种变化取决于合金的成分，并且在接近60at。％Fe的成分时，例如，随着Ar压力从2 to 10 mTorr的增加，在10 measuredkOe下测得的磁化强度增加30倍。磁性能可以通过两种现象（超顺磁性和自旋玻璃行为）的组合得到很好的解释，并且较大的变化部分与磁相关区域的数量密度有关。通过X射线衍射，透射电子显微镜和X射线吸收精细结构光谱对微观结构的检查表明，它与Ar压力之间没有明显的差异。这表明，即使是非常细微的变化，也会极大地影响非晶态Fe-Zr薄膜的磁性能，从而为利用非晶态合金的磁性能表征非晶态微结构提供了可能性。
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