| 纳米尺寸自旋阀中电流驱动的自旋波发射 | |
| 胡九宁 ; 陈培毅 ; 张磊 ; 任敏 ; 董浩 ; 邓宁 ; Hu Jiuning ; Chen Peiyi ; Zhang Lei ; Ren Min ; Dong Hao ; Deng Ning | |
| 2010-05-12 ; 2010-05-12 | |
| 关键词 | 自旋波发射 自旋传输矩 Landau-Lifshitz-Gilbert方程 自旋振荡模式 磁多层 spin wave emitting(SWE) spin transfer torque Landau-Lifshitz-Gilbert(LLG)equation spin oscillation modes magnetic multilayer O482.5 |
| 其他题名 | Spin Wave Emitting Effect Driven by Current-Induced Spin Transfer Torque in PSV |
| 中文摘要 | 提出了在纳米赝自旋阀中的电流感应自旋传输矩的磁动力学描述,成功地解释了在磁纳米多层结构中的电流驱动微波发射和电流感应磁化翻转现象。自旋流极化由在电导匹配时的自旋流和化学势连续性边界条件决定。自旋矩的纵向和横向分量在自旋阀的电流驱动微波发射和电流感应磁化翻转现象中扮演了不同的角色:纵向自旋矩分量决定了电流感应磁化翻转(CIMS)效应,而横向自旋矩是自旋波发射(SWE)效应所不可缺少的。根据这一理论,由LLG方程自然得到自旋波发射的双模,分别为横向自旋矩引发的X和Y方向的振动,并引起磁多层电阻以频率2w或w(进动频率)随时间变化。磁场和自旋流共同决定了自旋波发射的频率和功率,这一理论预言了某种特殊的磁多层结构,如磁层相互垂直的结构,将具有大得多的微波发射效率,这一结论已经被实验所证实。; A magnetic dynamics description for current-induced spin transfer torque(STT)in pseudo-spin-valve(PSV)was presented,and the effects of SWE and CIMS in magnetic multiplayernanostructures were illuminated.The spin current polarization is determined by the continuity boundary condition of spin current and chemical potential under the case of conduction matching.The roles of longitudinal and transverse components of STT are different in magnetic multiplayer that longitudinal one generates current induced magnetic switching(CIMS)effect,while transverse one is necessary for spin wave emitting(SWE)effect.From the theory,the double spin wave modes have been naturally obtained by Landau-Lifshitz-Bilbert(LLG)equation,which are X mode and Y mode,respectively,due to the transverse STT,and cause resistance of magnetic multiplayer altering following time with frequency 2 w or w(precession frequency).Magnetic field and spin current control frequency and power of SWE according to this theory,which predicts a special device structure,for example,the perpendicular configuration,should present much higher efficiency of SWE that has been demonstrated by some experiment results. |
| 语种 | 中文 ; 中文 |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/28851]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | 胡九宁,陈培毅,张磊,等. 纳米尺寸自旋阀中电流驱动的自旋波发射[J],2010, 2010. |
| APA | 胡九宁.,陈培毅.,张磊.,任敏.,董浩.,...&Deng Ning.(2010).纳米尺寸自旋阀中电流驱动的自旋波发射.. |
| MLA | 胡九宁,et al."纳米尺寸自旋阀中电流驱动的自旋波发射".(2010). |
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