Abstract
Effects of lattice distortion on the anisotropic magnetoresistance (AMR) of magnetron sputtered epitaxial La0.67Sr0.33MnO3 (LSMO) thin films grown on (001)-oriented SrTiO3 and MgO substrates were investigated. Lattice mismatch at the film/substrate interface gives rise to weak and strong lattice distortion of the LSMO/SrTiO3 and LSMO/MgO films, respectively. The Jahn-Teller electron-phonon coupling in LSMO leads to significant localization of the eg electrons, causing smaller magnetization, lower transition temperatures (TC, TMI) and larger resistivity. Moreover, AMR of the LSMO films show strong correlations with the substrates. Only two-fold symmetric AMR can be observed in the LSMO/SrTiO3 films. However, the AMR curves of the LSMO/MgO system show clear transitions between two- and four-fold symmetry. This behavior is ascribed to the lattice distortion in the LSMO films which enhances the magnetocrystalline anisotropy.
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