Magnetic anisotropy in symmetric magnetic colloidal quantum dots doped with few Mn2+ impurities

Shun-Jen Cheng*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Scopus citations

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 (Mn2+) dopants. The interplay between various relevant spin interactions and the discrete nature of Mn2+ spin distribution is shown to be essential in the magnetism of few Mn2+ -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.

Original languageEnglish
Article number245301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number24
DOIs
StatePublished - 1 Jun 2009

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