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Substrate-Induced Anomalous Electrical Transport and Magnetic Transitions in Epitaxial La0.66Sr0.33MnO3 Films Grown on (001) BaTiO3 Substrates

Published online by Cambridge University Press:  10 February 2011

T.K. Nath ,
M.K. Lee ,
C.B. Eom ,
M. Smoak ,
P.A. Ryan  and
F. Tsui
T.K. Nath
Affiliation:
Department of Mechanical Eng. and Materials Science, Duke University, Durham, NC 27708
M.K. Lee
Affiliation:
Department of Mechanical Eng. and Materials Science, Duke University, Durham, NC 27708
C.B. Eom
Affiliation:
Department of Mechanical Eng. and Materials Science, Duke University, Durham, NC 27708
M. Smoak
Affiliation:
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599
P.A. Ryan
Affiliation:
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599
F. Tsui
Affiliation:
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599
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Abstract

Effects of drastic change of 3-dimensional films' lattice strain by substrate structural transformations on the transport and magnetic properties of tensile strained epitaxial La0.66Sr0.33MnO3 thin films were studied using (001) BaTiO3 as the templates. These films exhibit dramatic jumps in electrical resistance and magnetization at temperatures very close to different crystallographic structural change of BaTiO3 substrate. Application of high magnetic field (50 kOe) suppresses both the electrical transport and magnetization jumps. The observed low-field sharp transitions correspond sudden changes in magnetic anisotropy, caused by the structural transformation of the substrate. The magnetic easy axis lies in the film plane along [100] direction having a strong correlation with the substrate-induced 3-dimensional strain states as determined by the normal and grazing incidence x-ray diffraction. The sudden substrate structural transformations imposes an additional drastic sharp change of the film strain which is found to reorient the magnetic easy axis within the film plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 201
Copyright
Copyright © Materials Research Society 2000

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