Effects of band broadening and shape of the density of states on the magnetic phase diagram

Abstract

We have revisited metallic ferromagnetism to examine the effects of band broadening due to electron-electron interaction on the magnetic phase diagram. Based on the generalized single band tight-binding Hamiltonian, we have explored the condition when the magnetization jumps discontinuously, by comparing results obtained by the local minima search and the total energy minimization. We have also investigated how the shape of the density of states (DOS) affects the magnetic phase diagram. We have found that a system with the DOS shape of a concave-type could have the discontinuous magnetization jump as the effective Stoner parameter increases.