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Enhanced low-field magnetoresistance in LSMO/SFO composite system |
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| Authors: | Zhenfa Zi Yankun Fu Qiangchun Liu Jianming Dai Yuping Sun |
| Affiliation: | a Department of Physics and Electronic Engineering, Hefei Normal University, Hefei 230601, China b School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, China c College of Science, Shandong University of Science and Technology, Qingdao 266510, China d Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China |
| Abstract: | The granular composites of (1−x)La0.7Sr0.3MnO3/xSrFe12O19 [(1−x)LSMO/xSFO] were prepared. The magnetic, electrical, and magnetoresistive properties of the composites were investigated systematically. Two magnetic transitions originating from LSMO and SFO are observed for x=0.05, 0.10, and 0.20. The addition of hard-magnetic SFO ferrite leads to the increased substantially resistivity of the composites and the shift of insulating-metallic transition temperature TIM correlated with LSMO. Enhanced low-field magnetoresistance (LFMR) in the composites can be mainly attributed to the enhanced spin disorder and spin-dependent tunneling at LSMO grain boundaries induced by the interaction between LSMO and SFO ferrite. The transport mechanisms in detail are analyzed in LSMO/SFO composite system. |
| Keywords: | Manganites Low-field magnetoresistance Spin-polarized tunneling |
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