Magnetotransport and magnetic properties of (Ga, Mn) As and its heterostructures

摘要

Introduction of high density of Mn in GaAs by low temperature molec- ular beam epitaxy results in a homogeneous diluted magnetic semiconductor (Ga,Mn) As, which exhibits ferromagnetism at low temperatures. Tempera- ture and magnetic field dependence of magnetotransport and magnetization of (Ga, Mn)As films revealed the Curie temperature Tc in the framework of the as 110 K and the P-d exchange, which explains Tc in the framework of the RKKY interaction. Multilayer heterostructures such as all-semiconductor Ferromagnetonmagnet/ferromagnet trilayer structures and resonant tun- neling diodes have been fabricated and studied.