Epitaxial ferromagnetic MnSb layers on GaAs substrates grown by hot-wall epitaxy

Epitaxial ferromagnetic MnSb layers were grown on GaAs(100), (211)A, and (111)A substrates by hot-wall epitaxy. Epitaxial orientation, surface morphology, interfacial structure, and magnetic property of the layers were studied. Growth-orientation dependencies of the structural properties were also investigated. The c-planes of MnSb are parallel to the GaAs(111) and (111) planes for GaAs(100) substrates, and parallel to the GaAs(111) plane for GaAs(211)A and (111)A substrates. Single-crystalline MnSb layers were obtained for GaAs(211)A and (111)A substrates. Growth of MnSb/GaAs(111)A shows a rather smooth surface and interface morphology in comparison with the other growth directions examined. An in-plane anisotropic magnetic property was observed, which depends on the inclination of the MnSb c-axis from the growth direction.