Low frequency noise peak near magnon emission energy in magnetic tunnel junctions
文献类型：期刊论文
| 作者 | Liu, L ; Xiang, L ; Guo, HQ ; Wei, J ; Li, DL ; Yuan, ZH ; Feng, JF ; Han, XF ; Coey, JMD |
| 刊名 | AIP ADVANCES
 |
| 出版日期 | 2014 |
| 卷号 | 4期号:12 |
| ISSN号 | 2158-3226 |
| 通讯作者 | Liu, L (reprint author), Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China. |
| 中文摘要 | We report on the low frequency (LF) noise measurements in magnetic tunnel junctions (MTJs) below 4 K and at low bias, where the transport is strongly affected by scattering with magnons emitted by hot tunnelling electrons, as thermal activation of magnons from the environment is suppressed. For both CoFeB/MgO/CoFeB and CoFeB/AlOx/CoFeB MTJs, enhanced LF noise is observed at bias voltage around magnon emission energy, forming a peak in the bias dependence of noise power spectra density, independent of magnetic configurations. The noise peak is much higher and broader for unannealed AlOx-based MTJ, and besides Lorentzian shape noise spectra in the frequency domain, random telegraph noise (RTN) is visible in the time traces. During repeated measurements the noise peak reduces and the RTN becomes difficult to resolve, suggesting defects being annealed. The Lorentzian shape noise spectra can be fitted with bias-dependent activation of RTN, with the attempt frequency in the MHz range, consistent with magnon dynamics. These findings suggest magnon-assisted activation of defects as the origin of the enhanced LF noise. (C) 2014 Author(s). |
| 资助信息 | National Basic Research Program of China (973 Program) [2011CBA00106, 2012CB927400]; State Key Project of Fundamental Research of Ministry of Science and Technology [MOST] [2010CB934401, 2014AA032904]; National Natural Science Foundation of China [NSFC] [11434014] |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/58845]  |
| 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 | Liu, L,Xiang, L,Guo, HQ,et al. Low frequency noise peak near magnon emission energy in magnetic tunnel junctions[J]. AIP ADVANCES,2014,4(12). |
| APA | Liu, L.,Xiang, L.,Guo, HQ.,Wei, J.,Li, DL.,...&Coey, JMD.(2014).Low frequency noise peak near magnon emission energy in magnetic tunnel junctions.AIP ADVANCES,4(12). |
| MLA | Liu, L,et al."Low frequency noise peak near magnon emission energy in magnetic tunnel junctions".AIP ADVANCES 4.12(2014). |
入库方式： OAI收割
来源：物理研究所
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