Spin hydrodynamic generation
Spin hydrodynamic generation
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DOI：
10.1038/nphys3526
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发表时间：
2015-11
期刊：
影响因子：
19.6
通讯作者：
R. Takahashi;M. Matsuo;M. Ono;K. Harii;H. Chudo;S. Okayasu;J. Ieda;S. Takahashi;S. Maekawa-
中科院分区：
文献类型：
--
作者：
R. Takahashi;M. Matsuo;M. Ono;K. Harii;H. Chudo;S. Okayasu;J. Ieda;S. Takahashi;S. Maekawa-
磁流体动能发电是将流体动能转化为电能。这种已应用于各种类型的发电的转换是由作用于带电粒子的洛伦兹力驱动的，因此需要一个磁场。另一方面，最近对自旋电子学、的研究揭示了磁场的作用与凝聚态的自旋-轨道相互作用的作用之间的相似性。这表明存在一种未被发现的途径，可以在不使用磁场的情况下实现流体动力学到电能的转换。在这里，我们展示了没有磁场的流体动力学产生的电压；我们在一个狭窄的通道中激励液体-金属流动，并观察到液体中纵向电压的产生。这种电压与带电或热电效应无关，但事实证明，它遵循基于自旋调节情景的普遍标度规则。结果表明，观测到的电压是由流体运动产生的自旋流产生的：自旋流体动力学产生。观察到的现象使我们能够制造机械自旋电流和发电机，为流体和自旋电子学打开了一扇门。
Magnetohydrodynamic generation,,,is the conversion of fluid kinetic energy into electricity. Such conversion, which has been applied to various types of electric power generation, is driven by the Lorentz force acting on charged particles and thus a magnetic field is necessary,. On the other hand, recent studies of spintronics,,,,,,,,,,,,,,,,,,have revealed the similarity between the function of a magnetic field and that of spin–orbit interactions in condensed matter. This suggests the existence of an undiscovered route to realize the conversion of fluid dynamics into electricity without using magnetic fields. Here we show electric voltage generation from fluid dynamics free from magnetic fields; we excited liquid-metal flows in a narrow channel and observed longitudinal voltage generation in the liquid. This voltage has nothing to do with electrification or thermoelectric effects, but turned out to follow a universal scaling rule based on a spin-mediated scenario. The result shows that the observed voltage is caused by spin-current generation from a fluid motion: spin hydrodynamic generation. The observed phenomenon allows us to make mechanical spin-current and electric generators, opening a door to fluid spintronics.