Softening of Spin-Wave Stiffness near the Ferromagnetic Phase Transition in Diluted Magnetic Semiconductors

Abstract

Employing the self-consistent Green's function approach, we studied the temperature dependence of the spin-wave stiffness in diluted magnetic semiconductors. Note that the Green's function approach includes the spatial and temperature fluctuations simultaneously which was not possible within conventional Weiss mean-field theory. It is rather interesting that we found the stiffness becomes dramatically softened as the critical temperature is approached, which seems to explain the mysterious sharp drop of magnetization curves in samples within diffusive regime.

4 pages, 1 figure

Cited by in corpus (4)

• Thermodynamics of the frustrated $J_1$-$J_2$ Heisenberg ferromagnet on the body-centered cubic lattice with arbitrary spin
• Spin dynamics in the diluted ferromagnetic Kondo lattice model
• Non-collinear Exchange Coupling in Trilayer Magnetic Junction and its Connection to Fermi Surface Topology
• Spatial trends of non-collinear exchange coupling mediated by itinerant carriers with different Fermi surfaces