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Properties of charge and magnetic impurities in a spin-polarized electron gas: A semiclassical approach
, Article Physica E: Low-Dimensional Systems and Nanostructures ; Volume 28, Issue 3 , 2005 , Pages 313-322 ; 13869477 (ISSN) ; Esfarjani, K ; Sharif University of Technology
2005
Abstract
Analytical studies on the effect of charge and magnetic impurities in a spin-polarized electron gas (SPEG) are carried out using a Thomas-Fermi semiclassical approximation (TFSA). The susceptibility matrix of an SPEG is calculated within the TFSA framework. Charge, spin and mixed charge-spin screening lengths are defined and calculated for the bulk metals (Fe, Co and Ni). It is found that these screening lengths do not strongly depend on temperature in metallic samples. Based on the Ruderman-Kittel-Kasuya-Yoshida (RKKY) model, the magnetic response function is then used to calculate the dependence of the exchange coupling between two ferromagnetic layers. It is seen that the exchange...