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Optically Controlled Nanomagnets

Published online by Cambridge University Press:  31 January 2011

Sebastian Mackowski ,
Tak Gurung ,
Grzegorz Karczewski ,
Howard E Jackson  and
Leigh Smith
Sebastian Mackowski
Affiliation:
mackowski@fizyka.umk.pl, Nicolaus Copernicus University, Institute of Physics, Torun, Poland
Tak Gurung
Affiliation:
gurungtak@gmail.com, University of Cincinnati, Department of Physics, Cincinnati, Ohio, United States
Grzegorz Karczewski
Affiliation:
karcz@ifpan.edu.pl, Polish Academy of Sciences, Institute of Physics, Warsaw, Poland
Howard E Jackson
Affiliation:
howard.jackson@uc.edu, University of Cincinnati, Department of Physics, Cincinnati, Ohio, United States
Leigh Smith
Affiliation:
leigh.smith@uc.edu, University of Cincinnati, Department of Physics, Cincinnati, Ohio, United States
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Abstract

We report on single dot photoluminescence imaging and spectroscopy at B=0T on magnetically doped CdMnTe self-assembled quantum dots with average Mn concentration of several percent. Quasi-resonant excitation with circularly polarized laser leads to formation of magnetic polarons with magnetization induced by the laser light. In this case all quantum dots are polarized in the same direction. In contrast, when the dots are populated using above the barrier excitation, with randomly polarized excitons, the resultant magnetization is random and varies from dot to dot. These experiments demonstrate a way to control the magnetization of magnetically doped quantum dots by means of light excitation. In addition, they point towards extremely long spin memory times in these structures, reaching hundreds of microseconds, making CdMnTe quantum dots promising candidates for local magnetic field sources on the nanoscale.

Keywords

II-VIMnoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1208: Symposium O – Excitons and Plasmon Resonances in Nanostructures II , 2009 , 1208-O01-03
Copyright
Copyright © Materials Research Society 2010

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