Influence of Sintering Temperature on Low-field Spin-polarized Tunneling Magnetoresistance of La0.7Ca0.3MnO3

Các tác giả

  • Pham Thanh Phong Tác giả
  • Do Hung Manh Tác giả
  • Le Van Hong Tác giả
  • Nguyen Xuan Phuc Tác giả
  • Nguyen Van Khiem Tác giả
  • Vu Van Hung Tác giả

Tóm tắt

In this study we report the effect of sintering temperature on the low field magnetoresistance (LFMR) of La0.7Ca0.3MnO3 manganite synthesized through sol-gel technique. The La0.7Ca0.3MnO3 has been sintered at 600°C, 700°C, 800°C, 900°C and 1200°C. The crystallite as well as particle size also show strong dependence on the sintering temperature. While the ferromagnetic – paramagnetic (FM-PM) transition temperature remains almost constant, the metal – insulation transition temperature drop gradual and the low field magnetoresistance (LFMR) increase with a decrease in grain size. We have analyzed our data based on the spin – polarized transport of conduction electrons at the grain boundaries.

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Tiểu sử tác giả

  • Pham Thanh Phong
    Ninh Hoa Department of Education and Training, Khanh Hoa, Vietnam

Đã Xuất bản

2008-07-17

Số

Tập 18 Số 1 (2008)

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