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Title: Magnetotransport of La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} multilayers with ultrathin manganite layers

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.

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40203930
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 89; Journal Issue: 11; Other Information: DOI: 10.1063/1.1362649; Othernumber: JAPIAU000089000011006973000001; 492111MMM; PBD: 1 Jun 2001; Journal ID: ISSN 0021-8979
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CURIE POINT; DEPOSITION; LASERS; MAGNETIZATION; MAGNETORESISTANCE; PHYSICS; SUPERLATTICES; THICKNESS; TRANSMISSION ELECTRON MICROSCOPY; TRANSPORT; X-RAY DIFFRACTION

Citation Formats

Dorr, K, Walter, T, Sahana, M, Muller, K -H, Nenkov, K, Brand, K, and Schultz, L. Magnetotransport of La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} multilayers with ultrathin manganite layers. United States: N. p., 2001. Web. doi:10.1063/1.1362649.
Dorr, K, Walter, T, Sahana, M, Muller, K -H, Nenkov, K, Brand, K, & Schultz, L. Magnetotransport of La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} multilayers with ultrathin manganite layers. United States. https://doi.org/10.1063/1.1362649
Dorr, K, Walter, T, Sahana, M, Muller, K -H, Nenkov, K, Brand, K, and Schultz, L. Fri . "Magnetotransport of La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} multilayers with ultrathin manganite layers". United States. https://doi.org/10.1063/1.1362649.
@article{osti_40203930,
title = {Magnetotransport of La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3} multilayers with ultrathin manganite layers},
author = {Dorr, K and Walter, T and Sahana, M and Muller, K -H and Nenkov, K and Brand, K and Schultz, L},
abstractNote = {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.},
doi = {10.1063/1.1362649},
url = {https://www.osti.gov/biblio/40203930}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 11,
volume = 89,
place = {United States},
year = {2001},
month = {6}
}