| 纳米级Sr_2FeMoO_6/CeO_2复合材料磁致电阻效应研究 |
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| 引用本文： | 李相虎,李丹. 纳米级Sr_2FeMoO_6/CeO_2复合材料磁致电阻效应研究[J]. 华东师范大学学报(自然科学版), 2010, 2010(3): 57-62 |
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| 作者姓名： | 李相虎 李丹 |
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| 作者单位： | 武汉工业学院,数理科学系,武汉,430023 |
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| 基金项目： | 湖北省教育厅科学研究计划项目，武汉工业学院科研启动基金 |
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| 摘 要： | 研究具有纳米级晶粒尺寸的(Sr_2FeMoO_6)_(1-x)/(CeO_2)_x复合材料的电输运性质.发现其低场磁致电阻效应在整个温区内要高于纯Sr_2FeMoO_6多晶材料.外加磁场为2 kOe(1 Oe=1000/(4π)A/m时,x=0.3的复合材料在10K与300 K的磁致电阻分别为纯SFMO样品的1.7与1.3倍.表明载流子在晶界处的隧穿效应加强了其磁致电阻效应.
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| 关 键 词： | 溶胶 凝胶法 Sr2FeMoO6 磁致电阻 溶胶 凝胶法 Sr2FeMoO6 磁致电阻 |
| 收稿时间： | 2009-06-17 |
| 修稿时间： | 2009-09-15 |
Enhanced low-field magnetoresistance in nanostructured Sr2 FeMoO6/CeO2 composites |
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| LI Xiang-hu,LI Dan. Enhanced low-field magnetoresistance in nanostructured Sr2 FeMoO6/CeO2 composites[J]. Journal of East China Normal University(Natural Science), 2010, 2010(3): 57-62 |
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| Authors: | LI Xiang-hu LI Dan |
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| Affiliation: | Department of Mathematics and Physics, Wuhan Polytechnic University, Wuhan 430023, China |
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| Abstract: | The electric transport properties of the nanostructrued (Sr2FeMoO6)1- x/(CeO2) xcomposition were investigated. It was found that the low field magnetoresistance of the composition is higher than that of the pure Sr2FeMoO6/CeO2 material in the whole region of temperature. The magnetoresistance ratios at 10 K and 300 K with H=2 kOe for the x =0.3 sample are 1.7 times and 1.3 times as large as that for the pureSr2FeMoO6, respectively. This means that the spin dependent tunneling at the interfaces of grain boundaries is responsible for the enhanced MR. |
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| Keywords: | Sol gel method Sr2FeMoO6 magnetoresistance |
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