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The effect of Oxygen partial pressure during deposition in the magnetic properties of ZnO thin film

Published online by Cambridge University Press:  14 January 2011

Anis Biswas ,
Wang Shirong ,
Sandeep Nagar ,
L. Belova  and
K. V. Rao
Anis Biswas
Affiliation:
Department of Materials Science-Tmfy-MSE, The Royal Institute of Technology, S- 100 44, Stockholm, Sweden
Wang Shirong
Affiliation:
Department of Materials Science-Tmfy-MSE, The Royal Institute of Technology, S- 100 44, Stockholm, Sweden
Sandeep Nagar
Affiliation:
Department of Materials Science-Tmfy-MSE, The Royal Institute of Technology, S- 100 44, Stockholm, Sweden
L. Belova
Affiliation:
Department of Materials Science-Tmfy-MSE, The Royal Institute of Technology, S- 100 44, Stockholm, Sweden
K. V. Rao
Affiliation:
Department of Materials Science-Tmfy-MSE, The Royal Institute of Technology, S- 100 44, Stockholm, Sweden
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Abstract

We have studied the magnetic properties of 100 nm thick ZnO thin films prepared by magnetron sputtering in different oxygen partial pressures (ratio of oxygen pressure to total pressure in deposition chamber, POxy). Only the films fabricated at POxy below ~ 0.5 show room temperature ferromagnetism. The saturation magnetization at room temperature is initially found to increase as POxy increases and reaches maximum value of ~ 5 emu/gm at POxy ~ 0.3 and then starts to decrease and becomes diamagnetic for POxy > 0.5. From small angle XRD study of structural properties of the films, we find that the lattice stress developed in the film along c-axis also exhibits a similar behavior with the variation of POxy. Thus, both the room temperature ferromagnetism and lattice stress appear to originate from the intrinsic defects present in the sample.

Keywords

oxidespintronicmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1292: Symposium K – Oxide Nanoelectronics , 2011 , mrsf10-1292-k12-45
Copyright
Copyright © Materials Research Society 2011

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References

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