Title: Magnetic anisotropy in symmetric magnetic colloidal quantum dots doped with few Mn(2+) impurities
Authors: Cheng, Shun-Jen
Department of Electrophysics
Issue Date: 1-Jun-2009
Abstract: We present numerical exact diagonalization studies of the magnetism in magnetic II-VI colloidal semiconductor quantum dots charged with controlled number of electrons coupled to few magnetic-ion (Mn(2+)) dopants. The interplay between various relevant spin interactions and the discrete nature of Mn(2+) spin distribution is shown to be essential in the magnetism of few Mn(2+)-doped quantum dots. An interesting revealed feature is the existence of pronounced magnetic anisotropies in symmetric magnetic quantum dots, which are related to the orbital quenchings induced by electron-Mn spin interactions. The orbital quenching effects further lead to significant deviations of the magnetizations of randomly Mn-doped dots from the standard Brillouin-function descriptions.
URI: http://dx.doi.org/10.1103/PhysRevB.79.245301
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.79.245301
Volume: 79
Issue: 24
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