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Transport properties of hydrogenated ZnO microwires

Published online by Cambridge University Press:  09 August 2013

Israel Lorite ,
Pablo Esquinazi ,
Cecilia Zapata  and
Silvia P. Heluani
Israel Lorite*
Affiliation:
Division of Superconductivity and Magnetism, Institute for experimental Physics II, Fakultät für Physik und Geowissenschaften, 04103 Leipzig, Germany
Pablo Esquinazi
Affiliation:
Division of Superconductivity and Magnetism, Institute for experimental Physics II, Fakultät für Physik und Geowissenschaften, 04103 Leipzig, Germany
Cecilia Zapata
Affiliation:
Laboratorio de Física del Sólido, Dpto. de Física, FCEyT, Universidad Nacional de Tucumán, 4000 Tucumán, Argentina
Silvia P. Heluani
Affiliation:
Laboratorio de Física del Sólido, Dpto. de Física, FCEyT, Universidad Nacional de Tucumán, 4000 Tucumán, Argentina
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

We have studied the magnetoresistance (MR) of hydrogen plasma-treated pure ZnO wires of tens of micrometer diameter at different temperatures. A negative MR of 1% at 8 T applied field is measured for all wires at 4 K, independent of the temperature (300 K … 773 K) used during the hydrogen treatment. However, a positive MR develops, the higher the treatment temperature. The MR can be explained with a semiempirical model taking into account local magnetic moments and the s–d exchange interaction. These results together with field anisotropy in the MR indicate the appearance of magnetic order due to the hydrogen treatment in agreement with recently published reports on the influence of hydrogen in bulk ZnO single crystals. Hydrogen doping may provide a way to trigger defect-induced magnetism in small oxide structures.

Keywords

magnetoresistance (magnetic)hydrogenationoxide
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 1: Focus Issue: Synthesis of Nanostructured Functional Oxides , 14 January 2014 , pp. 78 - 83
Copyright
Copyright © Materials Research Society 2013 

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