Observation of Domain Wall Resistance in La_0.7Ca_0.3MnO₃ Films

Abstract:

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.

• Periodical: Solid State Phenomena (Volumes 152-153)
• Pages: 120-122
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.152-153.120
• Online since: April 2009
• Authors: K.V. Dyakonov, V.V. Popov, Vladimir Dyakonov, P. Gierlowski, S.J. Lewandowski, H. Szymczak
• Keywords: Curie Temperature, Domain Wall, Magnetocrystalline Anisotropy, Magnetoresistivity MR, Manganite, Thin Film

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