MAGNETIC-PROPERTIES OF CO70.3SI15B10FE4.7 AMORPHOUS POWDERS FROM CRYSTALLINE RIBBONS

Amorphous and magnetically soft Co70.3Si15B10Fe4.7 alloy can be fabric ated in powder form from fully crystallized glassy ribbons using a low energy ball milling technique. Magnetic saturation and anisotropy fie lds of as-milled and annealed powders were measured and compared with values obtained for amorphous and crystallized ribbons. All magnetic p roperties of powders are generally similar to those of metallic glassy ribbons, but can be easily modified by the preparation process. Prolo nged milling decreases the particle size from 10 to 0.1 mum and an inc rease in coercivity was observed. Additionally in wet conditions (hexa ne) and by application of surfactant during the milling process in mat erial considerable decrease in magnetocrystalline anistropy was found.