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Morphology and Magneto-optical Properties of Amorphous AlN Films Doped with Nickel

Published online by Cambridge University Press:  14 January 2011

W. M. Jadwisienczak ,
H. Tanaka ,
G. Chen ,
M. Kordesch  and
A. Khan
W. M. Jadwisienczak
Affiliation:
School of EECS, Ohio University, Athens, Ohio, U.S.A.
H. Tanaka
Affiliation:
School of EECS, Ohio University, Athens, Ohio, U.S.A.
G. Chen
Affiliation:
Department of Physics and Astronomy, Ohio University, Athens, OH, U.S.A.
M. Kordesch
Affiliation:
Department of Physics and Astronomy, Ohio University, Athens, OH, U.S.A.
A. Khan
Affiliation:
Department of Chemistry and Biochemistry, Ohio University, Athens, OH, U.S.A.
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Abstract

Structural and magneto-optical properties of Ni-doped amorphous AlN layers (a-AlN) deposited by radio frequency (rf) sputtering on Silicon (001) substrates were investigated. The as-grown material exhibits weak ferromagnetic behavior as evidenced by the magneto-optic Kerr effect (MOKE) measurement with Kerr rotation less than 100 μrad at room temperature regardless of the Ni fraction. The samples with a Ni concentration below 10 at.% show a weak but monotonically increasing MOKE signal with post-growth annealing temperature. A hundred-fold increase in the Kerr rotation value was observed for samples with Ni content exceeding 20 at.% after thermal annealing at 450°C in nitrogen; and the Kerr rotation value abruptly decreases above that temperature. The morphology of as-grown and annealed a-AlN:Ni films were characterized by small angle x-ray scattering and transmission electron microscopy. It was found that the as-deposited film contains nano-particles of different sizes with average diameters less than 30 nm. The size distribution of nano-particles in the thermally annealed a-AlN:Ni was studied as a function of annealing time and temperature. The results correlate well with those obtained from the MOKE measurements.

Keywords

amorphousNimagnetooptic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1290: Symposium I – Magnetism and Correlated Electronic Structure of Nitrides—Rare-Earth and Transition Metals as Constituents and Dopants , 2011 , mrsf10-1290-i06-03
Copyright
Copyright © Materials Research Society 2011

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