Clarification of enhanced ferromagnetism in Be-codoped InMnP fabricated using Mn/InP:Be bilayers grown by molecular beam epitaxy

Abstract

The p-type InMnP: Be epilayers were prepared by the sequential growth of Mn/InP: Be bilayers using molecular-beam-epitaxy and the subsequent in-situ annealing at 200-300 degrees C. In triple-axis x-ray diffraction patterns, the samples revealed a shoulder peak indicative of intrinsic InMnP. The ferromagnetic transition in InMnP: Be was observed to occur at the elevated temperature of similar to 140 K, and the ferromagnetic spin-domains clearly appeared in magnetic force microscopy images. The improved ferromagnetic properties are attributed to the increased p-d hybridation due to high p-type conductivity of InMnP: Be (p similar to 10(20) cm(-3)). The results suggest that enhanced ferromagnetism can be effectively obtained from Be-codoped InMnP. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3660274]