Ferromagnetic self-assembled quantum dots on semiconductor nanowires

Dinna G Ramlan; Steven J May; Jian-Guo Zheng; Jonathan E Allen; Bruce W Wessels; Lincoln J Lauhon

doi:10.1021/nl0519276

Ferromagnetic self-assembled quantum dots on semiconductor nanowires

Nano Lett. 2006 Jan;6(1):50-4. doi: 10.1021/nl0519276.

Authors

Dinna G Ramlan¹, Steven J May, Jian-Guo Zheng, Jonathan E Allen, Bruce W Wessels, Lincoln J Lauhon

Affiliation

¹ Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.

PMID: 16402786
DOI: 10.1021/nl0519276

Abstract

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(c) values of approximately 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.