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Flux growth of ZnO crystals doped by transition metals

✍ Scribed by Zdeněk Sofer; David Sedmidubský; Štěpán Huber; Jiří Hejtmánek; Miroslav Maryško; Karel Jurek; Martin Mikulics

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
688 KB
Volume
314
Category
Article
ISSN
0022-0248

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✦ Synopsis

ZnO crystals doped with Cr, Mn, Fe and Co were grown by the flux method. The prepared crystals revealed no phase separation detectable by X-ray diffraction. Structure properties were characterized by Raman and photoluminescence spectroscopy. For ZnO:Co, Mn and Cr, no spontaneous ferromagnetic moment was observed up to T ¼2 K whereas for the ZnO:Fe crystals the m(H) curves suggest the existence of 5 nm superparamagnetic iron clusters. At low temperatures the m(H) curves can be interpreted as a superposition of major paramagnetic and minor antiferromagnetic contribution. The paramagnetic part corresponds to the presence of Co 2 + , Fe 3 + , Mn 2 + ions and small Cr atom clusters.

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