Large low-field magnetoresistance observed in twinned La2/3Ca1/3MnO3 thin films epitaxially grown on yttria-stabilized zirconia-buffered silicon on insulator substrates

Li, J.; Wang, P.; Xiang, J. Y.; Zhu, X. H.; Peng, W.; Chen, Y. F.; Zheng, D. N.; Li, Z. W.
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p112514
Academic Journal
La2/3Ca1/3MnO3 thin films have been grown on yttria-stabilized zirconia (YSZ) buffered silicon-on-insulator (SOI) substrates by the pulsed laser deposition technique. While full cube-on-cube epitaxy was achieved for the YSZ layer, the top manganite layer was multioriented in plane, with a coexistence of cube-on-cube and cube-on-diagonal epitaxial structures. Due to a combined influence from the magnetocrystalline, shape, and stain-induced magnetic anisotropy, in zero field and low temperatures the local spin orientation varies across the large-angle grain boundaries. As a result, a quite large low-field magnetoresistance (LFMR) based on spin-dependent tunneling was observed. The film shows a resistance change of ∼20% in a magnetic field <1000 Oe at 50 K, which is promising for real applications.


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