| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 10643697 | Superlattices and Microstructures | 2005 | 6 Pages |
Abstract
We compare the magneto-transport in paramagnetic-ferromagnetic GaAs:Mn/MnAs granular hybrids and paramagnetic GaAs:Mn reference samples. The differences in the hole transport between the two systems at low temperatures arise due to carrier localization effects at the cluster-matrix interface in the hybrids. The localization is caused by a Schottky barrier formation at the interface as well as spin-dependent shifts of the hole bands caused by the stray field of the ferromagnetic clusters. The application of an external magnetic field leads to a delocalization of the carriers and thus a negative magneto-resistance effect. These effects can be simulated using a network model approach.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
C. Michel, C.H. Thien, S. Ye, P.J. Klar, W. Heimbrodt, S.D. Baranovskii, P. Thomas, M. Lampalzer, K. Volz, W. Stolz, B. Goldlücke,