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Spin wave spectrum in disordered Heisenberg spin systems

E.-V. MACOCIAN1,* , S. FILIP1

Affiliation

  1. Department of Physics, University of Oradea, Oradea, Romania

Abstract

We calculate the spin wave spectrum for three phenomenological diluted Heisenberg-like spin models that are representative for a qualitative description of the magnetic properties of diluted magnetic semiconductors. We investigate the combined effect of frustration induced by anisotropy and simulated annealing on the spin wave spectrum and temperature dependence of the magnetization. We analyze short-range model characterized by a constant coupling between the spins and a low coordination number, long-range model with a increased connectivity and RKKY model with an oscillating sign in the exchange coupling..

Keywords

Diluted magnetic semiconductors, Diluted Heisenberg – type spin models, Spin waves.

Submitted at: Dec. 2, 2005
Accepted at: May 18, 2006

Citation

E.-V. MACOCIAN, S. FILIP, Spin wave spectrum in disordered Heisenberg spin systems, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 3, pp. 1098-1104 (2006)