Probing origin of room temperature ferromagnetism in Ni ion implanted ZnO films with x-ray absorption spectroscopy

P. Srivastava, S. Ghosh, B. Joshi, P. Satyarthi, P. Kumar, D. Kanjilal, D. Buerger, S. Zhou, H. Schmidt, A. Rogalev, F. Wilhelm

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22 Scopus citations

Abstract

We report x-ray absorption at Zn and Ni K-edges in 200 keV Ni2+ ion implanted ZnO/sapphire films. The implantation fluences are 6×10 15 and 2×1016 ions/cm2, corresponding to 2% and 7% Ni in a ZnO matrix. The measurements reveal a marginal substitution of Ni in ZnO in both the films and also rule out the presence of ferromagnetic Ni metal clusters. The M-H and field cooled-zero field cooled measurements performed via SQUID magnetometry show that the films are ferromagnetic at room temperature, and the saturation magnetization of 2% Ni film is appreciably higher than that of 7% Ni film. The origin of ferromagnetism is understood on the basis of the oxygen vacancy mediated bound magnetic polaron model.

Original languageEnglish
Article number013715
JournalJournal of Applied Physics
Volume111
Issue number1
DOIs
StatePublished - 1 Jan 2012
Externally publishedYes

Bibliographical note

Funding Information:
Financial support from the Department of Science & Technology (DST), New Delhi, to carry out this work is gratefully acknowledged. One of us (P. Satyarthi) is thankful to University Grants Commission (UGC), New Delhi, for a fellowship. D.B. and H.S. acknowledge funding from the Bundesministerium für Bildung und Forschung (FKZ13N10144).

Funding

Financial support from the Department of Science & Technology (DST), New Delhi, to carry out this work is gratefully acknowledged. One of us (P. Satyarthi) is thankful to University Grants Commission (UGC), New Delhi, for a fellowship. D.B. and H.S. acknowledge funding from the Bundesministerium für Bildung und Forschung (FKZ13N10144).

FundersFunder number
Department of Science and Technology, Ministry of Science and Technology, India
University Grants Commission
Bundesministerium für Bildung und ForschungFKZ13N10144

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