Anisotropic magnetoresistance of La0.7Ca0.3MnO 3 thin film biepitaxial step junctions

S. F. Chen*, W. J. Chang, C. C. Hsieh, S. J. Liu, J. Y. Juang, K. H. Wu, T. M. Uen, J. Y. Lin, Y. S. Gou

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

The angular dependence of magnetoresistance (MR) of the La0.7 Ca0.3 Mn O3 thin film biepitaxial step junction (BSJ) shows a simple sin2 (θ) dependence in the in-plane high-field magnetoresistance, with θ being the angle between the applied field and current. This behavior is similar to the spin-orbit coupling-induced anisotropic magnetoresistance (AMR) commonly observed in transition ferromagnetic metals, except for two salient features. First, the maximum MR in the present case occurs at an oblique angle between the applied field (H) and electric current (I), while it is usually observed to occur when H∥I. Second, the AMR in the plane perpendicular to the film surface displays a remarkable value (Δρ ρ ∼8%), which is about an order of magnitude larger than that of the in-plane AMR. Such a large AMR cannot be solely explained by spin-orbit coupling effect. We suggest instead that the metallic and ferromagnetic inhomogeneous granules existing in the BSJ region might have acted as the source of spin-polarized scattering giving rise to the enhanced AMR when the colossal magnetoresistance was measured across the biepitaxial step boundaries.

原文英語
文章編號113906
期刊Journal of Applied Physics
100
發行號11
DOIs
出版狀態已發佈 - 2006

ASJC Scopus subject areas

  • 物理與天文學 (全部)

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