Lattice parameter effects on the magnetic properties of the binary Ni/Bi alloy

The influence of lattice parameters on the magnetic properties of the binary Nickel/Bismuth (Ni/Bi) alloy is investigated within the effective field theory. The temperature and applied field dependence of the magnetization of the Ni/Bi and its components (Ni, Bi1 and Bi2) are obtained. We find that the Tc=2.31 for the small lattice parameter (ha/2, hc/2 and ra/2), Tc=1.14 for the original lattice parameter (ha, hc and ra) and Tc=0.59 for the high lattice parameter (2ha, 2hc and 2ra); hence, the critical temperature is inversely proportional with the lattice parameter. Similarly, hysteresis loop areas of the Ni/Bi alloy are also inversely proportional with the lattice parameters.