Dresden 2011 – scientific programme
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.50: Poster
Friday, March 18, 2011, 11:00–14:00, P2
The effects of short-range order and clustering in dilute magnetic semiconductors: a non-local, multi-sublattice CPA investigation — •Alberto Marmodoro1,2, Julie Staunton1, and Arthur Ernst2 — 1University of Warwick, Department of Physics, CV4 7AL Coventry, United Kingdom — 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
The compound (Ga,TM)As, for TM transition metals such as Mn, represents a prototypical diluted magnetic semiconductor in which different magnetic coupling mechanisms coexist and are differently affected by dopant concentration, the nature of impurity states, formation of complexes etc.
We propose that the recently developed multi-sublattice, non-local coherent potential approximation (MS-NL-CPA) for a fully parameters-free multiple scattering investigation of disorder and short range ordering is well-suited to describe these effects beyond a single-site treatment. Our preliminary results demonstrate the enhanced accuracy of this generalized approach, and its potential to provide useful insights into the roles of Zener’s p−d and double-exchange effective interactions between the TM impurities, and the influence of other possible sources of defects such as co-dopants or interstitial and anti-site substitutions.