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Growth and Magnetic Structure of La0.67Sr0.33MnO3 Films

Published online by Cambridge University Press:  15 February 2011

G. W. Brown ,
Q. X. Jia ,
E. J. Peterson ,
D. K. Hristova ,
M. F. Hundley ,
J. D. Thompson ,
C. J. Maggiore ,
J. Tesmer  and
M. E. Hawley
G. W. Brown
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
Q. X. Jia
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
E. J. Peterson
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
D. K. Hristova
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
M. F. Hundley
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
J. D. Thompson
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
C. J. Maggiore
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
J. Tesmer
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
M. E. Hawley
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545, hawley@lanl.gov
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Abstract

Growth of LaMnO3 films that exhibit colossal magnetoresistance (CMR) has concentrated heavily on Ca doped materials. However, since the 33% Sr doped films are ferromagnetic at room temperature, they are ideal candidates for dual growth-magnetic structure studies using scanned probe techniques. In this study, interest was focused on the relations between growth/processing parameters, film morphology, and electronic/magnetic properties. In addition, films were grown on both LaA1O3 (LAO) and SrTiO3 (STO) to examine the results of stress induced by different substrate mismatches. La0.67Sr0.33MnO3 (LSMO) was grown using pulsed laser deposition (PLD) at temperatures between 500 °C and 800 °C. The film microstructure, crystallinity, and magnetic and electrical properties were characterized by room temperature scanning tunneling microscopy (STM), atomic force microscopy (AFM), magnetic force microscopy (MFM), x-ray diffraction, and temperature dependent transport and magnetization measurements. The growth trends follow those previously reported for Ca doped films. Grains increase in size with increasing temperature and coalesce into extended layers after annealing. Although topographic contributions complicate interpretation of some MFM data, local magnetic structure observed here is generally associated with film defects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 474: Symposium L – Epitaxial Oxide Thin Films III , 1997 , 179
Copyright
Copyright © Materials Research Society 1997

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References

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