Features of transport phenomenas in magnetic semiconductors with laser-induced periodic nanostructures

Artikel i vetenskaplig tidskrift, 2007

The mechanisms of formation of the laser-induced periodic surface and bulk nanostructures in magnetic semiconductors are considered. Their influence on transport phenomena in ferromagnetic semiconductors (FMSC) is investigated. It is shown that under action of laser beams (LB) a laser-induced periodic nanostructures - gratings of the electron and magnon temperatures, electron concentration and electric fields arises in FMSC. It is determined, that the illuminating of an external surface of the FMSC by several LB results in an emerging new effect - appearance of a dropping site on the voltage-current characteristic (VCC) of the FMSC with the static laser-induced periodic nanostructures. This effect can only be observed for the carrier concentration n >= 10(18) cm(-3), since for smaller concentration the contribution of an additional current caused by the presence of the laser-induced periodic nanostructures will be insignificant. (c) 2006 Elsevier B.V. All rights reserved.