Deep potential effect on magnetism of binary including spintronic material

Abstract

Magnetic moments on transition elements strongly depend on their circumstances. Generally, the magnetic moments, surrounded by neighbor atoms having deep potential, seem to be enhanced. For example, the moment on Iron (Fe) is indeed enhanced in the Ni 3Fe and Ni-Fe-Ga as shown in the previous calculation. 1) In both alloys, the nearest neighbors of Fe are Nickel (Ni) atoms, having deeper potential than Fe. To examine the effect of surrounding deep potential, the electronic structures of binary alloys between 3d-transition-metal elements are calculated for the B2 and L1 2 structure. The surrounding deeper potential draw the electronic states of the subject atoms into lower energy range and bring the various moments and interesting features. In other words, the effects of surrounding potential can control energy level of DOS peak or the band gap. Were the structure of Cu 3 V to be the Ll 2, the magnetic moment on V would become unusually large (1.99 μ B). Some alloys calculated show the high spin polarization at the Fermi level (E F). The values of the spin polarization at the E F evaluated from the density of states (DOS) for Ni 3Cr, Ni 3Co and CoFe are 0.94, -0.86 and -0.88 respectively. To control the energy level of DOS peak or the band gap would give us another means for finding new spintronic materials. The relations between whole magnetic moment and the valence electron concentration show the Slater-Pauling like behavior. © 2005 The Japan Institute of Metals.