Analytic model for Calculating Magnetic Susceptibility in a Polarized Electron Gas
Abstract
In this paper, we investigate analytically, the magnetic susceptibility of a spin-polarized electron gas (paramagnetic and ferromagnetic) under an external static field by Hartree-Fuck response function approximation. While there are numbers of forms to express the exchange interactions, we find it convenient to limit ourselves within the Stoner rigid two spin-band model, i.e., spin up and down bands are split by an exchange constant. We calculate the magnetic response function for this system. Finally, we express the results of our model and describe them. The results are agreement with others. Our numerical results may be useful in determining giant magneto resistance (GMR) and interlayer exchange coupling in magnetic multilayers based on spintronics devices.