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Research PapersNo Access

THE ORIGIN OF FERROMAGNETISM IN Ni-DOPED ZnO AND SnO₂

Racah Institute of Physics, The Hebrew University, Jerusalem, 91904, Israel

Corresponding author.

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Racah Institute of Physics, The Hebrew University, Jerusalem, 91904, Israel

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SOMOBRATA ACHARYA

National Institute for Material Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan

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, and

National Physical Laboratory, Dr K.S. Krishnan Road, New Delhi-110012, India

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https://doi.org/10.1142/S0217984910022329Cited by:3 (Source: Crossref)

Abstract

We present a detailed study of the ferromagnetism in nano-Ni-doped SnO₂ and ZnO. It is shown that the ferromagnetic behavior is not an intrinsic property of the systems but rather associated with the presence of nNi particles in both matrices. The ferromagnetic transition of all Ni-doped samples is at 631(2) K, the same as the T_C value for bulk Ni and nano-Ni powder. The saturation moments of the nano-Ni-doped samples scale with the Ni concentration and are much lower than that of pure Ni. This is due to the large surface area of nano-Ni particles which are partially oxidized due to nano-NiO. ¹¹⁹Sn Mössbauer spectroscopy studies on Sn_0.96Ni_0.04O₂ do not show any transferred hyperfine field on the Sn nuclei, confirming that the magnetic properties stem from a different phase.

Keywords:

PACS: 75.50.Pp, 75.47.Np, 78.40.Fy, 81.07.Bc

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Vol. 24, No. 02

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History

Received 19 March 2009

Revised 22 April 2009

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