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Crystal Structure Analysis of the Cr2O3 thin films

Published online by Cambridge University Press:  07 June 2012

Nobuyuki Iwata ,
Takuji Kuroda  and
Hiroshi Yamamoto
Nobuyuki Iwata
Affiliation:
CST, Nihon University, 7-24-1 Narashinodai, Funabashi-shi, Chiba, 274-8501 Japan
Takuji Kuroda
Affiliation:
CST, Nihon University, 7-24-1 Narashinodai, Funabashi-shi, Chiba, 274-8501 Japan
Hiroshi Yamamoto
Affiliation:
CST, Nihon University, 7-24-1 Narashinodai, Funabashi-shi, Chiba, 274-8501 Japan
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Abstract

Using DC-RF magnetron sputtering method, the stress free c- and r-oriented Cr2O3 thin films were grown on c- and r-cut sapphire substrates, respectively. The c-oriented film grown at 580 ºC shows the smoothest surface with a surface average (Ra) of 0.17, although the c-surface energy is the highest. The origin of the smooth surface is expected that the presence of a twin grain due to a dislocation of Cr atoms, demonstrated by a reciprocal space mapping. The step height corresponding to that of the bulk is clearly observed. The r-oriented films epitaxially grow without twin grain. The Ra is 1.56 in the film grown at 580 ºC because of deep trenches due to a lattice mismatch and no dislocation like c-oriented films. Since the surface energy of the r-surface is the lowest, the terrace is quite smooth in one grain even at higher substrate temperature of 840 ºC.

Keywords

crystal growthsputteringthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1454: Symposium HH – Nanocomposites, Nanostructures and Heterostructures of Correlated Oxide Systems , 2012 , pp. 33 - 38
Copyright
Copyright © Materials Research Society 2012

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