Magneto-volume effect of amorphous Fe(Co, Cr)Zr alloys

The thermal expansion curves and some magnetic properties of Fe sub 90-x M sub x Zr sub 10 (M triple bond Co, Cr) ternary amorphous alloys were measured, and the dependence on effective electron number N sub eff of the spontaneous volume magnetostriction omega sub s and the average magnetic moment mu were obtained. The results show that the omega sub s has a maximum at N sub eff approx8.1-8.2 where the mu begins to decrease drastically. This result provides experimental evidence that the Invar effect of the metal-metal amorphous alloys is also related to the instability of the ferromagnetism.