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Ferromagnetic Ordering at Room Temperature in ZnO:Co Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Sujeet Chaudhary ,
Kanwal Preet Bhatti ,
Shankhmala Kundu ,
Subhash C. Kashyap  and
Dinesh K. Pandya
Sujeet Chaudhary
Affiliation:
[email protected], Indian Institute of Technology Delhi, Department of Physics, Hauz Khas, New Delhi, 110016, India
Kanwal Preet Bhatti
Affiliation:
[email protected], Indian Institute of Technology Delhi, Department of Physics, Hauz Khas, New Delhi, 110016, India
Shankhmala Kundu
Affiliation:
[email protected], Indian Institute of Technology Delhi, Department of Physics, Hauz Khas, New Delhi, 110016, India
Subhash C. Kashyap
Affiliation:
[email protected], Indian Institute of Technology Delhi, Department of Physics, Hauz Khas, New Delhi, 110016, India
Dinesh K. Pandya
Affiliation:
[email protected], Indian Institute of Technology Delhi, Department of Physics, Hauz Khas, New Delhi, 110016, India
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Abstract

Intrinsic room temperature ferromagnetism is reported in sequentially sintered (in air ambient) nanocrystalline ZnO:Co (1 to 10 at% Co) samples prepared by chemical route. The Curie temperature of the ZnO:Co ferromagnetic samples is determined to be ∼495°C. The saturation magnetization of the ferromagnetic phase is found to first increase with Co concentration (up to 5%) and then decrease. It is also found to decrease with increase in sintering temperature up to 800°C; there after it remains unaffected till 1000°C. The d-d band transitions in the optical spectrum confirm that Co2+ substitutes Zn2+ in the ZnO lattice. A plausible explanation of the observed ferromagnetic ordering is presented in terms of Bound Magnetic Polarons model.

Keywords

ferromagneticII-VInanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 957: Symposium K – Zinc Oxide and Related Materials , 2006 , 0957-K10-01
Copyright
Copyright © Materials Research Society 2007

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References

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