SUPERLATTICES OF III-V SEMICONDUCTOR AND HETEROGENEOUS MAGNETIC LAYERS FOR CPP MAGNETOTRANSPORT

In this report we present the fabrication of superlattices consisting of heterogeneous magnetic GaAs:MnAs layers and InGaAs spacers with equ al thickness. The magnetic and structural properties of such a superla ttice are described, showing that under the appropriate annealing cond itions the low-temperature grown superlattice structure is preserved a nd that the MnAs magnetic clusters can be formed in 2D sheets separate d by thin (5 - 20 nm) semiconductor layers of good crystalline quality . CPP magnetotransport studies only show measurable MR at low temperat ures, dominated by the dilute magnetic semiconductor Ga(Mn)As host lat tice of the MnAs clusters.