| Fabrication and enhanced magnetoresistance of SiO2-coated Fe3O4 nanosphere compact | |
| Wang, Junfeng ; Shi, Jing ; Tian, Decheng ; Deng, Hong ; Li, Yadong ; Song, Pengyun ; Chen, Chinping | |
| 2010-05-06 ; 2010-05-06 | |
| 关键词 | TUNNELING MAGNETORESISTANCE NANOCRYSTALLINE MAGNETITE CLUSTER ASSEMBLIES FILMS NANOPARTICLES JUNCTIONS Physics, Applied |
| 中文摘要 | Magnetoresistance (MR) of a nanostructured material, monodisperse Fe3O4 nanospheres of about 200 nm coated with thin SiO2 and compactly cold pressed and sintered, has been investigated. A high MR, up to 10.8% at 1 T and 17% at 8 T, has been observed at 100 K. This enhanced MR is likely arising from the spin-polarized tunneling of conducting electrons through the insulating SiO2 boundaries. The decrease of the MR with the temperature increasing was attributed to the existence of the local spins in the grain boundaries. In addition, the MR ratio decreases with the SiO2 thickness increasing and sintering temperature decreasing. It suggests that the magnetic property of the insulating barrier is crucial for enhancing the low-field MR at a high temperature. (c) 2007 American Institute of Physics. |
| 语种 | 英语 ; 英语 |
| 出版者 | AMER INST PHYSICS ; MELVILLE ; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/12124]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | Wang, Junfeng,Shi, Jing,Tian, Decheng,et al. Fabrication and enhanced magnetoresistance of SiO2-coated Fe3O4 nanosphere compact[J],2010, 2010. |
| APA | Wang, Junfeng.,Shi, Jing.,Tian, Decheng.,Deng, Hong.,Li, Yadong.,...&Chen, Chinping.(2010).Fabrication and enhanced magnetoresistance of SiO2-coated Fe3O4 nanosphere compact.. |
| MLA | Wang, Junfeng,et al."Fabrication and enhanced magnetoresistance of SiO2-coated Fe3O4 nanosphere compact".(2010). |
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