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HL: Fachverband Halbleiterphysik
HL 20: Focus Session: Magnetic Semiconductors (jointly with MA)
HL 20.3: Talk
Monday, March 26, 2012, 17:00–17:15, EW 202
Ferromagnetic Semiconductor-Metal Transition in Heterostructures of Europium Monoxide — •Tobias Stollenwerk and Johann Kroha — Physikalisches Institut der Universität Bonn, Deutschland
Experiments on thin films of electron doped europium monoxide show a simultaneous ferromagnetic semiconductor-metal transition which goes along with a huge drop in resistivity over several orders of magnitude. Therefore, this material is a very promising candidate for spintronics applications. We have developed a theory which correctly predicts the simultaneous phase transition in thin films of electron doped EuO and the increase of the Curie temperature TC with doping concentration. The origin of the increased TC lies in the enhanced RKKY interaction between the localized 4f moments of the Eu atoms. Therefore, the phase transition is controlled by the population of the conduction band. We investigate the influence of film thickness and interface effects on the population of the conduction band and on the magnetic and electronic properties of the EuO film.