Magnetic properties of a disordered Heisenberg binary spin system with long-range exchange

Abstract

The influence of substitutional disorder on the magnetic properties of disordered Heisenberg binary spin systems with long-range exchange integrals is studied. The equation of motion for the magnon Green's function which is decoupled by the Tyablikov approximation is solved in the Blackman-Esterling-Berk(BEB) coherent potential approximation(CPA) framework, where the environmental disorder term is treated by virtual crystal approximation. The long-range exchange integrals include a power-law decaying and an oscillating Ruderman-Kittel-Kasuya-Yosida(RKKY) exchange interaction. The resulting spectral density, which is calculated by CPA self-consistent equation, is then used to estimate the magnetization and Curie temperature. The results show, in the case of the three-dimensional simple cubic systems, a strong influence of ferromagnetic long-range exchange integrals on the magnetization and Curie temperature of the systems, which is obviously different from the calculation of short-range interaction.

5 pages, 3 figures, to be accepted by PRB

References in corpus (3)

• On-site Coulomb interaction and the magnetism of (GaMn)N and (GaMn)As
• The Korringa-Kohn-Rostoker Non-Local Coherent Potential Approximation (KKR-NLCPA)
• RPA-CPA theory for magnetism in disordered Heisenberg binary systems with long range exchange integrals

Cited by in corpus (6)

• Study of off-diagonal disorder using the typical medium dynamical cluster approximation
• Probing of the interfacial Heisenberg and Dzyaloshinskii--Moriya exchange interaction by magnon spectroscopy
• Carrier induced ferromagnetism in diluted local-moment systems
• Spin waves in alloys at finite temperatures: application for FeCo magnonic crystal
• Spin-wave theory in a randomly disordered lattice: A Heisenberg ferromagnet
• Eigenmodes of a disordered FeCo magnonic crystal at finite temperatures