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Epitaxial Growth Mechanism and Physical Properties of Ultra thin Films of La0.6Sr0.4MnO3

Published online by Cambridge University Press:  10 February 2011

Yoshinori Konishi ,
Masahiro Kasai ,
Masashi Kawasaki  and
Yoshinori Tokura
Yoshinori Konishi
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan
Masahiro Kasai
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan
Masashi Kawasaki
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan Department of Innovative and Engineered Materials, Tokyo Inst. of Technology, Yokohama 226, Japan
Yoshinori Tokura
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305, Japan Department of Applied Physics, The University of Tokyo, Tokyo 113, Japan
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Abstract

Thin films of La1-xSrxMnO3 (x=0.4) were fabricated using pulsed laser deposition (PLD) methods. The surface morphology of the films was sensitively affected by oxygen pressure during deposition. At high oxygen pressure (∑150 mTorr), randomly aligned grains were nucleated on the epitaxial film. When the pressure was reduced to 100 mTorr, the epitaxial film had very smooth surface. Under this condition, the thickness dependence of resistivity and magnetization were analyzed. Even 6 nm thick film showed ferromagnetic metallic behavior. The AFM images of ulta thin films deposited on wet-etched SrTiO3 showed atomically flat terraces and 0.4 nm steps. The film growth mode can be tuned to either layer by layer or step flow by the deposition temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 9
Copyright
Copyright © Materials Research Society 1998

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References

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