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Room-temperature Ferromagnetic Zn0.95Co0.05O Diluted Magnetic Semiconducting Thin Films by Pulsed Laser Deposition

Published online by Cambridge University Press:  01 February 2011

Yuebin Zhang ,
Qing Liu ,
Thirumany Sritharan ,
Chee-Lip Gan  and
Sean Li
Yuebin Zhang
Affiliation:
eybzhang@ntu.edu.sg, Nanyang Technological University, School of Materials Science and Engineering, Block 171 Stirling Road #14-1115, Singapore, Singapore, 140171, Singapore
Qing Liu
Affiliation:
LIUQ0003@ntu.edu.sg, Nanyang Technological University, School of Materials Science and Engineering, Singapore, 639798, Singapore
Thirumany Sritharan
Affiliation:
ASSRITHARAN@ntu.edu.sg, Nanyang Technological University, School of Materials Science and Engineering, Singapore, 639798, Singapore
Chee-Lip Gan
Affiliation:
CLGan@ntu.edu.sg, Nanyang Technological University, School of Materials Science and Engineering, Singapore, 639798, Singapore
Sean Li
Affiliation:
sean.li@unsw.edu.au, Nanyang Technological University, School of Materials Science and Engineering, Singapore, 639798, Singapore
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Abstract

Co-doped ZnO thin films with room-temperature ferromagnetism have been successfully synthesized on (001) Si substrates at 450 °C by pulsed-laser deposition using a Zn0.95Co0.05O ceramic target. Their microstructural properties are carefully studied using atomic force microscopy, x-ray diffraction and high-resolution transmission electron microscopy. The oxidation state of Co and the ratio of Co/Zn are examined by x-ray photoelectron spectroscopy, and magnetic measurements are performed using SQUID. The results show that a single-phase crystalline Co-doped ZnO film was grown with (002) preferential orientation and some edge dislocations formed during the film growth. The origin of room-temperature ferromagnetism is explored. The presence of nanoclusters of any magnetic phase can be ruled out. The dislocations, coupled with oxygen vacancy, may contribute to the ferromagnetic properties in the much diluted magnetic semiconductor.

Keywords

spintroniclaser ablationferromagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 928: Symposium GG – Current and Future Trends of Functional Oxide Films , 2006 , 0928-GG05-04
Copyright
Copyright © Materials Research Society 2006

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