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Author Dorr, K. ♦ Walter, T. ♦ Sahana, M. ♦ Muller, K. -H. ♦ Nenkov, K. ♦ Brand, K. ♦ Schultz, L.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ CURIE POINT ♦ DEPOSITION ♦ LASERS ♦ MAGNETIZATION ♦ MAGNETORESISTANCE ♦ PHYSICS ♦ SUPERLATTICES ♦ THICKNESS ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ TRANSPORT ♦ X-RAY DIFFRACTION
Abstract The thickness dependence of electrical transport and magnetization of ultrathin La{sub 0.7}Sr{sub 0.3}MnO{sub 3} films has been investigated using epitaxial La{sub 0.7}Sr{sub 0.3}MnO{sub 3}(LSMO)/SrTiO{sub 3} multilayers prepared by pulsed laser deposition. Layer thicknesses range from 1.9 to 10 nm for both constituents. Microstructural characterization by x-ray diffraction and transmission electron microscopy has confirmed a well-defined superlattice structure, coherent growth, and fairly smooth interfaces of the samples. Magnetization measurements show a pronounced drop of the ferromagnetic Curie temperature below a LSMO thickness of d=3nm, accompanied by a strong rise of the coercive field. The in-plane electrical transport changes from metallic (d{rho}/dT{gt}0) to insulating at d{similar_to}2.3nm. Three different types of magnetoresistance (MR) have been observed for d{lt}3nm. In the sequence of decreasing d, the first resembles the grain boundary MR of polycrystalline LSMO, the second is positive, and the third is associated with a magnetic field-induced insulator-to-metal transition. Magnetic and transport results are discussed in the framework of a mixed-phase state of ferromagnetic metallic and less magnetically ordered insulating clusters in the ultrathin LSMO films. {copyright} 2001 American Institute of Physics.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-06-01
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 89
Issue Number 11


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