Magnetoresistance and magnetic properties of La{sub 1{minus}{ital x}}{triangledown}{sub {ital x}}MnO{sub 3{minus}{delta}} thin films
- IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
- Department of Physics, Brown University, Providence, Rhode Island 02912 (United States)
Epitaxial thin films of La{sub 1{minus}{ital x}}{triangledown}{sub {ital x}}MnO{sub 3{minus}{delta}}(0{le}{ital x}{le}0.33) where {triangledown} is a vacancy have been grown on (100) SrTiO{sub 3} substrates by pulsed laser deposition. The lanthanum deficiency results in self doping of the system without the need for divalent ion substitution. Both the films and the bulk targets used for deposition were ferromagnetic and showed giant magnetoresistance (GMR). The films increased in saturation magnetization {ital M}{sub {ital s}} and Curie temperature {ital T}{sub {ital c}} with increasing {ital x}. The {ital T}{sub {ital c}}, however, was about the same as found in Ca{sub {ital x}} substitutions. Bulk samples showed little change in {ital M}{sub {ital s}} and {ital T}{sub {ital c}} with vacancy concentration. {ital M}{sub {ital s}} in bulk samples is about half the value found in the films which have theoretical saturations for {ital x}{ge}0.2. GMR in the films is a few hundred percent but the bulk values are 25{percent} at {ital H}=1.8 T. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 281732
- Report Number(s):
- CONF-951101--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
EPITAXY
FERROMAGNETIC MATERIALS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETORESISTANCE
MANGANESE OXIDES
SUBSTOICHIOMETRY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THIN FILMS
VACANCIES