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Studies of Ni and Co Doped Amorphous AlN for Magneto-optical Applications

Published online by Cambridge University Press:  31 January 2011

Wojciech M. Jadwisienczak ,
Hiroki Tanaka ,
Marty E. Kordesch ,
Aurangzeb Khan ,
Savas Kaya  and
Venkat Vuppuluri
Wojciech M. Jadwisienczak
Affiliation:
jadwisie@ohio.edu, Ohio University, School of EECS, Stocker Center 363, Athens, Ohio, 45701, United States, 740-593-2067, 740-593-0007
Hiroki Tanaka
Affiliation:
ht287002@ohio.edu, Ohio University, School of EECS, Athens, Ohio, United States
Marty E. Kordesch
Affiliation:
kordesch@helios.phy.ohiou.edu, Ohio University, Department of Physics and Astronomy, Athens, Ohio, United States
Aurangzeb Khan
Affiliation:
khan@phy.ohiou.edu, Ohio University, Department of Chemistry and Biochemistry, Athens, Ohio, United States
Savas Kaya
Affiliation:
kaya@ohio.edu, Ohio University, School of EECS, Athens, Ohio, United States
Venkat Vuppuluri
Affiliation:
rv214706@ohio.edu, Ohio University, School of EECS, Athens, Ohio, United States
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Abstract

Magneto-optical properties of Ni- and Co-doped amorphous AlN thin films were investigated as a function of post grown annealing temperature using magneto-optical Kerr effect (MOKE) spectroscopy. The x-ray diffraction spectra confirmed that the as-grown material is amorphous and retained its morphology after thermal treatment; however the sample morphology strongly depends on the concentration of incorporated transition metals. We observed with help of transmission electron microscopy and atomic force microscopy that the films surface containing TMs with concentrations larger than ∼10 at.% undergo morphological changes suggesting possible Ni and Co atom clustering. Significant enhancement of the polar Kerr rotation signal was observed for Ni- and Co-doped a-AlN materials annealed above 300 °C in nitrogen. The studied materials have shown strong magnetic isotropy in polar geometry whereas the MOKE measurements in longitudinal geometry did not show an explicit signal for the transition metals doped a-AlN studied.

Keywords

magnetoopticamorphousthin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1202: Symposium I – III-Nitride Materials for Sensing, Energy Conversion and Controlled Light-Matter Interactions , 2009 , 1202-I05-06
Copyright
Copyright © Materials Research Society 2010

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