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Magneto-transport and magnetic properties of (1-x)La0.7Ca0.3MnO3+xAl2O3 composites |
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| Authors: | TD ThanhPT Phong NV DaiDH Manh NV KhiemLV Hong NX Phuc |
| Institution: | a Institute of Material Science, Viet Nam Academy of Science and Technology, Hanoi City, Viet Nam b Nhatrang Pedagogic College, 1- Nguyen Chanh Str., Nhatrang City, Khanhhoa Province, Viet Nam c Department of Natural Sciences, Hongduc University, 307 -Le Lai Str. Thanhhoa City, Viet Nam |
| Abstract: | We report magneto-transport and magnetic properties of (1-x)La0.7Ca0.3MnO3+xAl2O3 composites synthesized through a solid-state reaction method combined with a high energy milling method. Most interestingly, the effective magnetic anisotropy is found to decrease with increase in the non-magnetic insulating Al2O3 phase fraction in the composites. In addition, we observed that the magnitude of low-field magnetoresistance arising from spin-polarized tunneling of conduction electrons, as well as that of high-field magnetoresistance, displays a Curie-Weiss law-like behavior. Finally, we found that the temperature dependence of low and high-field magnetoresistance is controlled predominantly by the nature of temperature response of surface magnetization of the particles. |
| Keywords: | Manganites composite Low field magnetoresistance Magnetic property Spin polarized tunneling |
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