Cotunneling enhancement of magnetoresistance in double magnetic tunnel junctions with embedded superparamagnetic NiFe nanoparticles
文献类型：期刊论文
| 作者 | Dempsey, KJ ; Hindmarch, AT ; Wei, HX ; Qin, QH ; Wen, ZC ; Wang, WX ; Vallejo-Fernandez, G ; Arena, DA ; Han, XF ; Marrows, CH |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2010 |
| 卷号 | 82期号:21 |
| 关键词 | COULOMB-BLOCKADE ELECTRONS |
| ISSN号 | 1098-0121 |
| 通讯作者 | Dempsey, KJ: Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England. |
| 中文摘要 | Temperature and bias voltage-dependent transport characteristics are presented for double magnetic tunnel junctions (DMTJs) with self-assembled NiFe nanoparticles embedded between insulating alumina barriers. The junctions with embedded nanoparticles are compared to junctions with a single barrier of comparable size and growth conditions. The embedded particles are characterized using x-ray absorption spectroscopy, transmission electron microscopy, and magnetometry techniques, showing that they are unoxidized and remain superparamagnetic to liquid helium temperatures. The tunneling magnetoresistance (TMR) for the DMTJs is lower than the control samples, however, for the DMTJs an enhancement in TMR is seen in the Coulomb blockade region. Fitting the transport data in this region supports the theory that cotunneling is the dominant electron transport process within the Coulomb blockade region, sequential tunneling being suppressed. We therefore see an enhanced TMR attributed to the change in the tunneling process due to the interplay of the Coulomb blockade and spin-dependent tunneling through superparamagnetic nanoparticles, and develop a simple model to quantify the effect, based on the fact that our nanoparticles will appear blocked when measured on femtosecond tunneling time scales. |
| 收录类别 | SCI |
| 资助信息 | U.K. EPSRC (Engineering and Physical Sciences Research Council); Royal Society; National Natural Science Foundation of China; U.S. Department of Energy, Office of Basic Energy Sciences for provision of NSLS beamtime |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/35249]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Dempsey, KJ,Hindmarch, AT,Wei, HX,et al. Cotunneling enhancement of magnetoresistance in double magnetic tunnel junctions with embedded superparamagnetic NiFe nanoparticles[J]. PHYSICAL REVIEW B,2010,82(21). |
| APA | Dempsey, KJ.,Hindmarch, AT.,Wei, HX.,Qin, QH.,Wen, ZC.,...&Marrows, CH.(2010).Cotunneling enhancement of magnetoresistance in double magnetic tunnel junctions with embedded superparamagnetic NiFe nanoparticles.PHYSICAL REVIEW B,82(21). |
| MLA | Dempsey, KJ,et al."Cotunneling enhancement of magnetoresistance in double magnetic tunnel junctions with embedded superparamagnetic NiFe nanoparticles".PHYSICAL REVIEW B 82.21(2010). |
入库方式： OAI收割
来源：物理研究所
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