SUPERLATTICE AND MULTILAYER STRUCTURES BASED ON FERROMAGNETIC SEMICONDUCTOR (GA,MN)AS

Ferromagnetic semiconductor (Ga,Mn)As-based superlattice and multilaye r structures, (Ga,Mn)As/(Al,Ga)As and (Ga,Mn)As/(In,Ga)As, were prepar ed by molecular beam epitaxy. X-ray diffraction measurements showed th at the thickness and alloy composition in the superlattices were well controlled. Magnetotransport measurements revealed the existence of fe rromagnetic order at low temperatures. Resonant tunneling diodes with (Ga,Mn)As showed features that are well explained by a simple physical picture. (C) 1998 Elsevier Science B.V. All rights reserved.