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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 1    February 2006

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Influence of annealing treatment on structural and magnetic
properties of double perovskite Sr2FeMoO6
FENG Xiao-mei(冯晓梅)1, LIU Guang-yao(刘广耀)2, HUANG Qing-zhen(黄清镇)3,
RAO Guang-hui(饶光辉)2

1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China;
2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,
Chinese Academy of Sciences, Beijing 100080, China;
3. NIST Center for Neutron Research, National Institute of Standards and Technology,
Gaithersburg, MA 20899, USA

Abstract:The structure, magnetic and electric properties of Sr2FeMoO6 (the as-made sample) and samples after heat treatment were investigated. The nuclear and magnetic structures of the samples were studied using neutron powder diffraction at room temperature. The results show that the tunneling magnetoresistance of polycrystalline Sr2FeMoO6 depends on its annealing temperature. Annealing at 800 ℃ makes the minimal magnetoresistance(MR) elevated, which may be due to the change of the grain size or the modified intergranular connections. Because of the impurity phase of Fe which probably affects the magnetotransport properties is much larger in sample C, so the MR is decreased by postannealing at 1100 ℃. Therefore, further enhancement of the tunneling magnetoresistance (TMR) can be realized by regulating the grain size at appropriate annealing temperature.

 

Key words: Sr2FeMoO6; double perovskite; neutron powder diffraction; magnetoresistance

ISSN 1672-7029
CN 43-1423/U

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