Spin-dependent electron transport in manganite bicrystal junctions

Journal Article · Thu Nov 15 00:00:00 EST 2012 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776112100093· OSTI ID:22069263

Demidov, V V; Ovsyannikov, G A; Borisenko, I V; Shadrin, A V ^[1]

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1. Russian Academy of Sciences, Kotel'nikov Institute of Radio Engineering and Electronics (Russian Federation)

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.

• OSTI ID: 22069263
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 115, Issue 5; Other Information: Copyright (c) 2012 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

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