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Journal of Nanoparticle Research

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01-04-2011 | Research Paper

Ferromagnetism in Cu-doped ZnSe semiconducting quantum dots

Authors: Pushpendra Kumar, Kedar Singh

Published in: Journal of Nanoparticle Research | Issue 4/2011

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Abstract

The projection of integrating optical, magnetic and electronic functionalities into a single material have aggravated passionate attention in mounting wide band gap diluted magnetic semiconductor (DMS) in the midst of room temperature ferromagnetism. We report the evidence of ferromagnetism in Cu-doped ZnSe quantum dots (QDs) below room temperature, grown from a single source precursor by lyothermal method with the sizes of approximately 3.2–5.14 nm. QDs mainly exhibit paramagnetic behavior between 80 and 300 K, with a weak ferromagnetic/anti-ferromagnetic exchange at lower temperature as observed by superconducting quantum interference device (SQUID) magnetometer. From the Curie–Weiss behavior of the susceptibility, Curie temperature (T _c) of Cu-doped ZnSe sample has been evaluated. From EPR, we obtain the Lande-g factor in the Zeeman interaction term as 2.060. Photoluminescence and EPR measurements support and confirm the view that Cu²⁺ substitutes for Zn²⁺ in Cu-doped ZnSe quantum dots.

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Title: Ferromagnetism in Cu-doped ZnSe semiconducting quantum dots
Authors: Pushpendra Kumar
Kedar Singh
Publication date: 01-04-2011
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 4/2011
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-010-9914-5

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