Abstract
Magnetic properties of Fe-Ni and Fe-Ni-Cu alloys prepared by milling were investigated in relation to the Invar effect. By the mechanical alloying preparation of Fe-Ni binary alloys, FCC single phase was obtained in Fe0.65Ni0.35 and exclusively BCC phase in Fe0.80Ni0.20. Between these two compositions, FCC and BCC mixed phase appeared. The atomic volume of the FCC phase decreases with increasing Fe concentration.Fe0.67Ni0.33, (Fe0.75Ni0.25)0.9Cu0.1, Fe0.68Ni0.32 and Fe0.69Ni0.31 with high concentrations of iron, where the FCC phase is almost unstable, show large pressure coefficients of the magnetization (dMs/dP)/Ms (0) at 4.2 K, about −2.5×10-2 GPa-1. In contrast, (Fe0.65Ni0.35)0.9Cu0.1 and (Fe0.67Ni0.33)0.9Cu0.1 with lower concentrations of iron show much smaller values of about −0.02×10-2GPa-1 at 4.2 K. The estimated pressure coefficient of the magnetization of the FCC phase in Fe0.69Ni0.31 after subtracting the contribution of the BCC phase in the alloy is as large as −11.9×10-2GPa-1.
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