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Title: In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films

Abstract

To analyze the conducting and magnetic properties near the film and substrate interface in manganites, ultrathin films (thickness{<=}100 A ) of La{sub 0.7}Sr{sub 0.3}MnO{sub 3} were epitaxially grown by molecular-beam epitaxy on single-crystal (001) LaAlO{sub 3} (110) NdGaO{sub 3}, and (001) SrTiO{sub 3} substrates. Structural, magnetic, and magnetoresistive properties were investigated. All samples exhibit a substrate-independent decrease of the c-lattice parameter for thinnest films. Highly anisotropic behavior in both transport and magnetic properties were measured along the in-plane directions parallel to the substrate crystallographic axes. In particular, for the thinnest films (60 A ), the negative magnetoresistance at about 120 K with the average current along one of the crystallographic directions, is larger than the room-temperature colossal value. In the same low-temperature range, with the current along the other in-plane crystallographic direction, the magnetoresistance changes sign (resulting to be magnetic field independent for T{approx}150 K). Such an in-plane anisotropy of transport and magnetic properties is investigated with respect to possible intrinsic and extrinsic physical mechanisms.

Authors:
; ;  [1]; ; ; ; ; ; ;  [2]
  1. CNR-INFM SuperMat and Department of Physics, University of Salerno, Via S. Allende, I - 84081 Baronissi (Saudi Arabia) (Italy)
  2. CNR-INFM Coherentia and Department of Physics, University of Salerno, Via S. Allende, I - 84081 Baronissi (Saudi Arabia) (Italy)
Publication Date:
OSTI Identifier:
20853743
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 74; Journal Issue: 13; Other Information: DOI: 10.1103/PhysRevB.74.134419; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; ANISOTROPY; ELECTRIC CURRENTS; INTERFACES; LANTHANUM COMPOUNDS; LATTICE PARAMETERS; LAYERS; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETORESISTANCE; MANGANATES; MOLECULAR BEAM EPITAXY; MONOCRYSTALS; STRONTIUM TITANATES; SUBSTRATES; THIN FILMS

Citation Formats

Orgiani, P, Polichetti, M, Zola, D, Petrov, A Yu, Adamo, C, Aruta, C, Barone, C, De Luca, G M, Galdi, A, and Maritato, L. In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.74.134419.
Orgiani, P, Polichetti, M, Zola, D, Petrov, A Yu, Adamo, C, Aruta, C, Barone, C, De Luca, G M, Galdi, A, & Maritato, L. In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films. United States. https://doi.org/10.1103/PHYSREVB.74.134419
Orgiani, P, Polichetti, M, Zola, D, Petrov, A Yu, Adamo, C, Aruta, C, Barone, C, De Luca, G M, Galdi, A, and Maritato, L. Sun . "In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films". United States. https://doi.org/10.1103/PHYSREVB.74.134419.
@article{osti_20853743,
title = {In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films},
author = {Orgiani, P and Polichetti, M and Zola, D and Petrov, A Yu and Adamo, C and Aruta, C and Barone, C and De Luca, G M and Galdi, A and Maritato, L},
abstractNote = {To analyze the conducting and magnetic properties near the film and substrate interface in manganites, ultrathin films (thickness{<=}100 A ) of La{sub 0.7}Sr{sub 0.3}MnO{sub 3} were epitaxially grown by molecular-beam epitaxy on single-crystal (001) LaAlO{sub 3} (110) NdGaO{sub 3}, and (001) SrTiO{sub 3} substrates. Structural, magnetic, and magnetoresistive properties were investigated. All samples exhibit a substrate-independent decrease of the c-lattice parameter for thinnest films. Highly anisotropic behavior in both transport and magnetic properties were measured along the in-plane directions parallel to the substrate crystallographic axes. In particular, for the thinnest films (60 A ), the negative magnetoresistance at about 120 K with the average current along one of the crystallographic directions, is larger than the room-temperature colossal value. In the same low-temperature range, with the current along the other in-plane crystallographic direction, the magnetoresistance changes sign (resulting to be magnetic field independent for T{approx}150 K). Such an in-plane anisotropy of transport and magnetic properties is investigated with respect to possible intrinsic and extrinsic physical mechanisms.},
doi = {10.1103/PHYSREVB.74.134419},
url = {https://www.osti.gov/biblio/20853743}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 13,
volume = 74,
place = {United States},
year = {2006},
month = {10}
}