CJCU

Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (11): 2385.doi: 10.7503/cjcu20111115

• Article: Inorganic Chemistry • Previous Articles     Next Articles

Preparation, Structure and Magnetoresistance Effect of La1-xCaxMnO3 Epitaxial Film

CHEN Rui1,2, FENG Ming1, GOU Xi-Cheng1, LI Hai-Bo1,2   

  1. 1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, China;
    2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China
  • Received:2011-11-24 Online:2012-11-10 Published:2012-10-15

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Abstract:

La1-xCaxMnO3(x=0, 0.05, 0.1, 0.2) epitaxial films were grown on LaAlO3 (100) single-crystal substrate by sol-gel spin-coating method. The crystal structure, morphology, valence state, curie temperature and magnetoresistance effect of the films were investigated via X-ray diffractometer, atom force microscope, focused ion beam system, X-ray photoelectron spectrometer, vibrating sample magnetometer and superconduc-ting quantum interference device. The results show that the crystal structure of the film is cubic with high (h00)-oriented epitaxial direction and smooth surface. The maximum of Curie temperature is 264 K. Near the Curie temperature, the magnetic properties exhibit a transition from ferromagnetism to paramagnetism. The La0.95Ca0.05MnO3 film exhibit a maximum magnetoresistance ratio of 80.9% at 210 K and 2.0 T magnetic field.

Key words: La1-xCaxMnO3 epitaxial film, Sol-gel spin-coating method, Curie temperature, Colossal Magnetoresistance(CMR) effect

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