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Structural, Optical and Magnetic Properties of Co and Fe Doped ZnO Thin Films Grown by Radio Frequency Magnetron Sputtering

Published online by Cambridge University Press:  01 February 2011

Luis Manuel Angelats ,
Maharaj S Tomar ,
Rahul Singhal ,
Oscar P Perez ,
Hector J Jimenez  and
Ricardo Martinez
Luis Manuel Angelats
Affiliation:
langelats@yahoo.com, National University of Trujillo, Physics, P.O. Box 9016, Trujillo, La Libertad, 0044, Peru, 51-44-297155, 51-44-247922
Maharaj S Tomar
Affiliation:
mtomar@uprm.edu, University of Puerto Rico, Physics, P.O. Box 9016, Mayaguez, 00680, Puerto Rico
Rahul Singhal
Affiliation:
rahulsinghal_25@yahoo.com, University of Puerto Rico, Physics, P.O. Box 9016, Mayaguez, 00680, Puerto Rico
Oscar P Perez
Affiliation:
operalesperez@yahoo.com, University of Puerto Rico, General Engineering, P.O. Box 9044, Mayaguez, 00680, Puerto Rico
Hector J Jimenez
Affiliation:
hjj@uprm.edu, University of Puerto Rico, Physics, P.O. Box 9016, Mayaguez, 00680, Puerto Rico
Ricardo Martinez
Affiliation:
hjj@uprm.edu, University of Puerto Rico, Physics, P.O. Box 9016, Mayaguez, 00680, Puerto Rico
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Abstract

Zn0.90Co0.10O and Zn0.85[Co0.50Fe0.50]0.15O targets were used to grow thin films by rf magnetron sputtering. XRD patterns of the films showed a strong preferred orientation along c-axis. Zn0.90Co0.10O film showed a transmittance above 75% in the visible range, while the transmittance of the Zn0.85[Co0.50Fe0.50]0.15O film was about 45%; with three absorption peaks attributed to d-d transitions of tetrahedrally coordinated Co2+. The band gap values for Zn0.90Co0.10O and Zn0.85[Co0.50Fe0.50]0.15O films were 2.95 and 2.70 eV respectively, which are slightly less than ZnO bulk. The Zn0.90Co0.10O film showed a relatively large positive magnetoresistance (MR) at the high magnetic field in the temperature range from 7 to 50 K, which reached 11.9% a 7K for the magnetoresistance. The lowest MR was found at 100 K. From M-H curve measured at room temperature shown a probable antiferromagnetic behavior, although was possible to observe little coercive field of 30 Oe and 40 Oe for Zn0.90Co0.10O and Zn0.85[Co0.50Fe0.50]0.15O films, respectively.

Keywords

Znmagnetic propertiesoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K10-51
Copyright
Copyright © Materials Research Society 2007

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