Half -metallic Ferromag netism in the Zinc-blende MS(M=Li, Na & K) u nder Pressure and Stress

Half-metallic ferromagnets, whe re one of t he two spin channels is metallic while the other has an energy gap around the Fermi energy, attract increasing research interest in nano-electronics as potential materials for spintronic device applications; in particular, as a sour ce of spin-p olarized ca rriers injecte d into semiconductors[۱]. Crystal structure of half-metal in zinc-blen de are appr opriate with structure of semicondu ctors in grou p III-V, so they can grow epitaxially on this s emiconducto rs. If the lattice parameters of bot h compound s are slightly different, stress is entered to the system along the gro wth. In thi s case with changing t he lattice p arameter al ong the dire ction perpendicular to the surface, the super natant system becomes tetragonal. Therefore in order t o study the interface between half-metals an d semicon ductors, at first it must be determined whether these compo unds maintain their half-metallic properties under stress caused by growth on semiconductors? In th is article w e investigate this issue and study the half-metallic property of zinc- blende MS (M=Li, Na & KS) under pressure and stress. First time G ao et al.[۲] were investigated these compoun ds especially in the NaC l structure.

کلیدواژه ها:

Half-metallic ، Ferro magnet ، Spi ntronic ، Density functio nal theory ، S tress