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Spin-dependent electron transport in manganite bicrystal junctions

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Abstract

Magnetic bicrystal films and junctions of magnetic La0.67Sr0.33MnO3 (LSMO) and La0.67Ca0.33MnO3 (LCMO) films epitaxially grown on NdGaO3 substrates with the (110) planes of their two parts misoriented (tilted) at angles of 12°, 22°, 28°, and 38° are investigated. For comparison, bicrystal boundaries with a 90° misorientation of the axes of the NdGaO3 (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.

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Authors and Affiliations

  1. Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Mokhovaya ul. 11, Moscow, 125009, Russia

    A. M. Petrzhik, V. V. Demidov, G. A. Ovsyannikov, I. V. Borisenko & A. V. Shadrin

  2. Chalmers University of Technology, SE-41296, Gothenburg, Sweden

    G. A. Ovsyannikov & A. V. Shadrin

Authors
  1. A. M. Petrzhik
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  2. V. V. Demidov
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  3. G. A. Ovsyannikov
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  4. I. V. Borisenko
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  5. A. V. Shadrin
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Correspondence to A. M. Petrzhik.

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Original Russian Text © A.M. Petrzhik, V.V. Demidov, G.A. Ovsyannikov, I.V. Borisenko, A.V. Shadrin, 2012, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2012, Vol. 142, No. 5, pp. 994–1004.

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Petrzhik, A.M., Demidov, V.V., Ovsyannikov, G.A. et al. Spin-dependent electron transport in manganite bicrystal junctions. J. Exp. Theor. Phys. 115, 876–884 (2012). https://doi.org/10.1134/S1063776112100093

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  • DOI: https://doi.org/10.1134/S1063776112100093

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