Carrier-induced ferromagnetism in a diluted Hubbard model

Abstract

Carrier-induced ferromagnetism is investigated in a diluted Hubbard model for ordered impurity arrangements. The delicate competition between particle-hole processes contributing to the spin couplings results in a rich variety of behaviour. The ferromagnetic transition temperature obtained within the spin-fluctuation theory is in good agreement with reported values for $\mathrm{G}{\mathrm{a}}_{1-\mathrm{x}}\mathrm{M}{\mathrm{n}}_{\mathrm{x}}\mathrm{N}$.

8 pages, 10 figures