Magnetic behaviour of high coercivity Nd50Fe40Si10 amorphous ribbons

Extensive magnetic studies on Nd 50 Fe 40 Si 10 melt-spun ribbons with thicknesses up to 150 μm were performed. The large value of the coercive field up to 300 kA/m at room temperature and its dependence on the cooling rate as well as the DC M ZFC and M FC and AC-susceptibility measurements for the Nd 50 Fe 40 Si 10 fully amorphous ribbons indicate the coexistence of two kinds of magnetic order: long-range ferromagnetic order and short-range spin-glass order.