MAGNETIC-PROPERTIES OF CO-Y AMORPHOUS-ALLOYS PREPARED BY MILLING

The crystal structures of YCo5 and YCo2 are transformed into a topologically random atomic arrangement by milling in an analogy with those of sputtered amorphous alloys. The magnetic state of YCo2 is changed from paramagnetic to ferromagnetic, accompanying the change in the coordination number and in the atomic distance of Co-Co from 6.0 and 2.55 A to 6.7 and 2.42 A, respectively. From X-ray diffraction studies and magnetic measurements, it is concluded that milled and sputtered amorphous alloys exhibit very similar structural and magnetic properties.