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Title: Spin-dependent electron transport in manganite bicrystal junctions

Abstract

Magnetic bicrystal films and junctions of magnetic La{sub 0.67}Sr{sub 0.33}MnO{sub 3} (LSMO) and La{sub 0.67}Ca{sub 0.33}MnO{sub 3} (LCMO) films epitaxially grown on NdGaO{sub 3} substrates with the (110) planes of their two parts misoriented (tilted) at angles of 12 Degree-Sign , 22 Degree-Sign , 28 Degree-Sign , and 38 Degree-Sign are investigated. For comparison, bicrystal boundaries with a 90 Degree-Sign misorientation of the axes of the NdGaO{sub 3} (110) planes were fabricated. The directions of the axes and the magnetic anisotropy constants of the films on both sides of the boundary are determined by two independent techniques of magnetic resonance spectroscopy. The magnetic misorientation of the axes in the substrate plane has been found to be much smaller than the crystallographic misorientation for tilted bicrystal boundaries, while the crystallographic and magnetic misorientation angles coincide for boundaries with rotation of the axes. An increase in the magnetoresistance and characteristic resistance of bicrystal junctions with increasing misorientation angle was observed experimentally. The magnetoresistance of bicrystal junctions has been calculated by taking into account the uniaxial anisotropy, which has allowed the contributions from the tunneling and anisotropic magnetoresistances to be separated. The largest tunneling magnetoresistance was observed on LCMO bicrystal junctions, in whichmore » the characteristic resistance of the boundary is higher than that in LSMO boundaries.« less

Authors:
; ; ; ;  [1]
  1. Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation)
Publication Date:
OSTI Identifier:
22069263
Resource Type:
Journal Article
Journal Name:
Journal of Experimental and Theoretical Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 5; Other Information: Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1063-7761
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; CALCIUM COMPOUNDS; COMPARATIVE EVALUATIONS; CRYSTAL STRUCTURE; CRYSTALS; ELECTRONS; EPITAXY; FILMS; LANTHANUM COMPOUNDS; MAGNETIC MATERIALS; MAGNETIC RESONANCE; MAGNETORESISTANCE; MANGANATES; SPIN; STRONTIUM COMPOUNDS; SUBSTRATES; TUNNEL EFFECT

Citation Formats

Petrzhik, A. M., E-mail: petrzhik@hitech.cplire.ru, Demidov, V. V., Ovsyannikov, G. A., Borisenko, I. V., and Shadrin, A. V. Spin-dependent electron transport in manganite bicrystal junctions. United States: N. p., 2012. Web. doi:10.1134/S1063776112100093.
Petrzhik, A. M., E-mail: petrzhik@hitech.cplire.ru, Demidov, V. V., Ovsyannikov, G. A., Borisenko, I. V., & Shadrin, A. V. Spin-dependent electron transport in manganite bicrystal junctions. United States. doi:10.1134/S1063776112100093.
Petrzhik, A. M., E-mail: petrzhik@hitech.cplire.ru, Demidov, V. V., Ovsyannikov, G. A., Borisenko, I. V., and Shadrin, A. V. Thu . "Spin-dependent electron transport in manganite bicrystal junctions". United States. doi:10.1134/S1063776112100093.
@article{osti_22069263,
title = {Spin-dependent electron transport in manganite bicrystal junctions},
author = {Petrzhik, A. M., E-mail: petrzhik@hitech.cplire.ru and Demidov, V. V. and Ovsyannikov, G. A. and Borisenko, I. V. and Shadrin, A. V.},
abstractNote = {Magnetic bicrystal films and junctions of magnetic La{sub 0.67}Sr{sub 0.33}MnO{sub 3} (LSMO) and La{sub 0.67}Ca{sub 0.33}MnO{sub 3} (LCMO) films epitaxially grown on NdGaO{sub 3} substrates with the (110) planes of their two parts misoriented (tilted) at angles of 12 Degree-Sign , 22 Degree-Sign , 28 Degree-Sign , and 38 Degree-Sign are investigated. For comparison, bicrystal boundaries with a 90 Degree-Sign misorientation of the axes of the NdGaO{sub 3} (110) planes were fabricated. The directions of the axes and the magnetic anisotropy constants of the films on both sides of the boundary are determined by two independent techniques of magnetic resonance spectroscopy. The magnetic misorientation of the axes in the substrate plane has been found to be much smaller than the crystallographic misorientation for tilted bicrystal boundaries, while the crystallographic and magnetic misorientation angles coincide for boundaries with rotation of the axes. An increase in the magnetoresistance and characteristic resistance of bicrystal junctions with increasing misorientation angle was observed experimentally. The magnetoresistance of bicrystal junctions has been calculated by taking into account the uniaxial anisotropy, which has allowed the contributions from the tunneling and anisotropic magnetoresistances to be separated. The largest tunneling magnetoresistance was observed on LCMO bicrystal junctions, in which the characteristic resistance of the boundary is higher than that in LSMO boundaries.},
doi = {10.1134/S1063776112100093},
journal = {Journal of Experimental and Theoretical Physics},
issn = {1063-7761},
number = 5,
volume = 115,
place = {United States},
year = {2012},
month = {11}
}