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

Pham Thanh Phong; Do Hung Manh; Le Van Hong; Nguyen Xuan Phuc; Nguyen Van Khiem; Vu Van Hung

doi:10.15625/0868-3166/18/1/10690

Influence of Sintering Temperature on Low-field Spin-polarized Tunneling Magnetoresistance of La_0.7Ca_0.3MnO₃

Pham Thanh Phong, Do Hung Manh, Le Van Hong, Nguyen Xuan Phuc, Nguyen Van Khiem, Vu Van Hung

Author affiliations

Authors

Pham Thanh Phong Ninh Hoa Department of Education and Training, Khanh Hoa, Vietnam
Do Hung Manh Institute of Materials Science, VAST
Le Van Hong Institute of Materials Science, VAST
Nguyen Xuan Phuc Institute of Materials Science, VAST
Nguyen Van Khiem Department of Natural Sciences, Hong Duc University, 307 Le Lai Str. Thanh Hoa City, Vietnam
Vu Van Hung Department of Natural Sciences, Hong Duc University, 307 Le Lai Str. Thanh Hoa City, Vietnam

DOI:

https://doi.org/10.15625/0868-3166/18/1/10690

Abstract

In this study we report the effect of sintering temperature on the low field magnetoresistance (LFMR) of La_0.7Ca_0.3MnO₃ manganite synthesized through sol-gel technique. The La_0.7Ca_0.3MnO₃ 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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Published

18-07-2008

How to Cite

[1]

P. T. Phong, D. H. Manh, L. V. Hong, N. X. Phuc, N. V. Khiem, and V. V. Hung, “/sub>”;, Comm. Phys., vol. 18, no. 1, pp. 48–57, Jul. 2008.

IEEE

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Issue

Vol. 18 No. 1 (2008)

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Papers

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