Pressure Effect on the Spontaneous Volume Magnetostriction of Fe–Ni and Fe–Pt Invar Alloys

抄録

Pressure effect on the spontaneous volume magnetostriction ω_s of Fe–Ni and Fe–Pt Invar alloys is studied by measuring the pressure dependence of lattice constants usins X-ray diffraction technique. The pressure derivative of ω_s and the magnetic contribution to the compressibility in Fe–Ni Invar alloy near 0 K are found to be largely different from those in Fe–Pt Invar alloy. The differences are interpreted phenomenologically in terms of the pressure dependence of T_c and M₀ and suggested to relate with the stability of magnetic moment at low temperature.