Spin Waves in Disordered III-V Diluted Magnetic Semiconductors

Abstract

We propose a new scheme for numerically computing collective-mode spectra for large-size systems, using a reformulation of the Random Phase Approximation. In this study, we apply this method to investigate the spectrum and nature of the spin-waves of a (III,Mn)V Diluted Magnetic Semiconductor. We use an impurity band picture to describe the interaction of the charge carriers with the local Mn spins. The spin-wave spectrum is shown to depend sensitively on the positional disorder of the Mn atoms inside the host semiconductor. Both localized and extended spin-wave modes are found. Unusual spin and charge transport is implied.

14 pages, including 11 figures

References in corpus (4)

• Transition temperature of ferromagnetic semiconductors: a dynamical mean field study
• Monte Carlo Study of Ferromagnetism in (III,Mn)V Semiconductors
• Monte Carlo simulations of an impurity band model for III-V diluted magnetic semiconductors
• Two-component approach for thermodynamic properties in diluted magnetic semiconductors

Cited by in corpus (12)

• Disorder in Diluted Spin Systems
• Theory of spin waves in ferromagnetic (Ga,Mn)As
• Spin dynamics in (III,Mn)V ferromagnetic semiconductors: the role of correlations
• Ferromagnetism in a dilute magnetic semiconductor -- Generalized RKKY interaction and spin-wave excitations
• Carrier induced ferromagnetism in diluted local-moment systems
• Ferromagnetism and metallic state in digital (Ga,Mn)As heterostructures
• Three--body Correlation Effects on the Spin Dynamics of Double--Exchange Ferromagnets
• Spin dynamics in the diluted ferromagnetic Kondo lattice model
• Clustering induced suppression of ferromagnetism in diluted magnets
• Magnetic susceptibility of diluted magnetic semiconductors at low carrier densities
• Effects of dilution and disorder on magnetism in diluted spin systems
• Magnetic Field Controlled Surface Localization of Spin-Wave Ferromagnetic Resonance Modes in 3D Nanostructures