Spin ordering in semiconductor heterostructures with ferromagnetic {delta} layers

Journal Article · Mon Jun 15 04:00:00 EDT 2009 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776109060144· OSTI ID:21246871

The magnetic properties of a magnetic-metal {delta} layer placed in a nonmagnetic nondegenerate semiconductor matrix are studied theoretically. The diffusion-induced spread of the {delta} layer, which is inevitable during {delta} doping, is taken into account, and a model is proposed in which this layer consists of a thin core enriched in metal atoms and a smeared periphery depleted in metal atoms. The exchange and potential scattering of carriers by the core causes confinement states in the form of two-dimensional spin-polarized sub-bands inside the energy gap of the semiconductor. The mechanism of the indirect exchange between impurity spins located in the strongly dilute peripheral region of the {delta} layer through partly filled confinement states is analyzed. In the case of a ferromagnetic core, impurity spins are oriented along (or opposite to) the core magnetization owing to carrier polarization on the confinement states. The magnetic configuration of impurity spins at the periphery of the {delta} layer is phenomenologically studied with allowance for the confinement mechanism of the interaction of impurity spins and the superexchange through the deep states in the semiconductor matrix.

• OSTI ID: 21246871
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 6 Vol. 108; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGE CARRIERS
CONFINEMENT
ENERGY GAP
IMPURITIES
LAYERS
MAGNETIC PROPERTIES
MAGNETIZATION
METALS
POLARIZATION
POTENTIAL SCATTERING
SEMICONDUCTOR MATERIALS
SPIN
SPIN ORIENTATION
TWO-DIMENSIONAL CALCULATIONS