Spin-dependent tunneling in modulated structures of (Ga,Mn)As

Details Spin-dependent tunneling in modulated structures of (Ga,Mn)As Spin-dependent tunneling in modulated structures of (Ga,Mn)As

2006-07-07

arxiv.org/abs/cond-mat/0607206v1

Physics

Condensed Matter

Materials Science

9 pages, 13 figures, submitted to PRB

Scientific paper

A model of coherent tunneling, which combines multi-orbital tight-binding approximation with Landauer-B\"uttiker formalism, is developed and applied to all-semiconductor heterostructures containing (Ga,Mn)As ferromagnetic layers. A comparison of theoretical predictions and experimental results on spin-dependent Zener tunneling, tunneling magnetoresistance (TMR), and anisotropic magnetoresistance (TAMR) is presented. The dependence of spin current on carrier density, magnetization orientation, strain, voltage bias, and spacer thickness is examined theoretically in order to optimize device design and performance.

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