The Effect of Doping Fe on Magnetic Property of Colossal Magnetoresistance of La_0.7Sr_0.3MnO₃ Materials

Abstract:

Colossal magnetoresistance of La_0.7Sr_0.3MnO₃ compounds (x=0~0.18) were prepared by the sol-gel technique. Partial Mn atoms were replaced by Fe atoms and its influence on the structure, magnetic properties and colossal magnetoresistance were also studied. Our results show that the Curie temperature decreases fast, the ferromagnetic property is weakened, the electric conductivity is decreased and the colossal magnetoresistance is enhanced as an increase of replacing Mn by Fe atoms. It was convinced by the theory of molecular field that doping Fe atoms can decrease the ferromagnetic exchange coupling of La_0.7Sr_0.3MnO₃

• Periodical: Applied Mechanics and Materials (Volumes 644-650)
• Pages: 4860-4863
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.644-650.4860
• Online since: September 2014
• Authors: Bao He Li*, Ping Ping Xiang
• Keywords: Colossal Magnetoresistance, Electric Conductivity, Ferromagnetic Exchange Coupling, Sol-Gel Technique

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