Observation of Domain Wall Resistance in La0.7Ca0.3MnO3 Films

Abstract:

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We report the study of the magnetoresistance (MR) and resistivity as a function of temperature in epitaxial thin films of the La0.67Ca0.33MnO3 type (LCMO). The films deposited onto Y-cut of single-crystalline LiNbO3 (LNO) substrates by pulsed-laser deposition in an on-axis geometry. For comparison, the same manganite film deposited onto LaAlO3 (LAO) substrate is studied. The MR of LCMO/LNO film is found to be anisotropic and exhibits a hysteresis loops in low magnetic fields. When magnetic field is parallel to the film plane a number of jumps are observed in the MR below magnetic fields H~6 kOe. These jumps reflect the presence of pinning centers for domain walls. Evidently, a lattice deformation produced by a mismatch of lattice constants LCMO film and LNO, which lead to distortion of the film, is the origin of such strong pinning centers.

Info:

Periodical:

Solid State Phenomena (Volumes 152-153)

Edited by:

N. Perov

Pages:

120-122

DOI:

10.4028/www.scientific.net/SSP.152-153.120

Citation:

K.V. Dyakonov et al., "Observation of Domain Wall Resistance in La0.7Ca0.3MnO3 Films", Solid State Phenomena, Vols. 152-153, pp. 120-122, 2009

Online since:

April 2009

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$35.00

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