Abstract
Conversion-electron Mössbauer spectroscopy, energy-dispersive x-ray spectroscopy, and x-ray diffraction were used for surface studies of the as-quenched and hydrogenized metallic glass Fe90Zr10. Surface layers of as-quenched ribbon, paramagnetic at room temperature, were found to be overlaid by a ferromagnetic thin film. The overlayer is composed of α-Fe microcrystals and a crystalline compound (Fe3Zr). Magnetic α-Fe microcrystals are about 500 Å in diameter and are oriented with the (200) plane parallel to the Fe90Zr10 ribbon plane. Mössbauer spectra show that the magnetic moments of the precipitated small particles lie in the ribbon plane. A hydrogen-induced magnetic phase transformation, previously reported for bulk Fe90Zr10, was observed in the amorphous surface layers. At the same time, the magnetic crystalline overlayer disappears on the ribbon shiny surface.
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