Ferromagnetic self-assembled quantum dots on semiconductor nanowires

Ferromagnetic self-assembled alpha-MnAs quantum dots (QD) were grown epitaxially on metal catalyst-grown InAs nanowires (NW) by chemical vapor deposition, Magnetic force microscopy measurements demonstrated that the QDs are stable, single-domain ferromagnets with T, values of similar to 310 K. Single QD switching was demonstrated at fields as low as 60 Oe. The hybrid ferromagnetic/semiconductor QD/NW properties provide a promising basis for the development of nanowire spin-valves and magnetic memory devices.