Nanoscale magnet for semiconductor spintronics

Abstract

A hybrid nanostructure of diluted magnetic semiconductor quantum well (DMS-QW) has been fabricated by using a ferromagnetic CoPt -multilayered film with perpendicular magnetization. The nanoscale disk of DMS-QW with a diameter of 80 nm was embedded in the magnetic film generating magnetic fields perpendicular to the DMS-QW plane. As a result, exciton photoluminescence with circular-polarization properties arises in a zero external field, due to the giant Zeeman effects of excitons. It indicates that the perpendicular magnetic fields applied from the CoPt film align the exciton spins in the DMS nanoscale disk, acting as a nanoscale magnet for semiconductor spintronics. © 2006 American Institute of Physics.