Nanomagnonic devices based on the spin-transfer torque
Nanomagnonic devices based on the spin-transfer torque
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DOI：
10.1038/nnano.2014.88
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发表时间：
2014-07-01
影响因子：
38.3
通讯作者：
Demokritov, S. O.
中科院分区：
文献类型：
--
作者：
Urazhdin, S.;Demidov, V. E.;Demokritov, S. O.
磁振子学（1-3）是基于在磁介质中传播的自旋波（或其量子，称为磁振子）的信号传输和处理。与纳米等离子体利用金属纳米结构来限制和引导光频等离子体激元（4，5）的方式相同，纳米磁学使用纳米级磁波导来控制自旋波的传播（6）。纳米磁学物理学的最新进展，如自旋转移矩的发现（7，8），为纳米磁学创造了可能性。特别是，最近证明了纳米接触自旋扭矩器件可以辐射自旋波（9-11），作为磁振子应用的局部纳米级信号源（12）。然而，集成的自旋力矩磁振子电路的实施所必需的自旋力矩源与纳米磁波导的集成，迄今尚未实现。在这里，我们建议和实验证明了一种新的方法，这种集成，利用偶极场诱导的magnonic magnesaveguides。波导表现出良好的光谱匹配与自旋扭矩纳米振荡器，并使有效的自旋波的定向传输。我们的研究结果为利用自旋转移实现集成磁振子电路提供了一条实用的途径。
Magnonics(1-3) is based on signal transmission and processing by spin waves (or their quanta, called magnons) propagating in a magnetic medium. In the same way as nanoplasmonics makes use of metallic nanostructures to confine and guide optical-frequency plasmon-polaritons(4,5), nanomagnonics uses nanoscale magnetic waveguides to control the propagation of spin waves(6). Recent advances in the physics of nanomagnetism, such as the discovery of spin-transfer torque(7,8), have created possibilities for nanomagnonics. In particular, it was recently demonstrated that nanocontact spin-torque devices can radiate spin waves(9-11), serving as local nanoscale sources of signals for magnonic applications(12). However, the integration of spin-torque sources with nanoscale magnetic waveguides, which is necessary for the implementation of integrated spin-torque magnonic circuits, has not been achieved to date. Here, we suggest and experimentally demonstrate a new approach to this integration, utilizing dipolar field-induced magnonic nanowaveguides. The waveguides exhibit good spectral matching with spin-torque nano-oscillators and enable efficient directional transmission of spin waves. Our results provide a practical route for the implementation of integrated magnonic circuits utilizing spin transfer.