Spin pumping from nuclear spin waves
Spin pumping from nuclear spin waves
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DOI：
10.1038/s41567-018-0310-x
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发表时间：
2019-01-01
期刊：
影响因子：
19.6
通讯作者：
Saitoh, Eiji
中科院分区：
文献类型：
--
作者：
Shiomi, Yuki;Lustikova, Jana;Saitoh, Eiji
各种自旋电子现象源于晶体材料中电子自旋和其他自由度之间的角动量交换。许多自由度，如磁化(1)和机械运动(2)，已经统一到这个交换框架中。然而，核自转--一种关键的角动量--尚未被纳入。在这里，我们观察到来自核磁共振的自旋泵浦，在核磁共振中，核自旋动力学发射自旋流，即电子的自旋角动量流。通过使用倾斜的反铁磁体MnCO3，我们发现核磁共振产生了自旋流，其中由于加强的超精细耦合而建立了典型的核自旋波形成。核自旋对量子信息技术来说是不可或缺的(3)，也经常用于各种传感器，例如磁共振成像(4)。观察到的核磁共振自旋泵浦允许从原子核产生自旋流，并将使自旋电子探测核自旋态成为可能。
Various spintronic phenomena originate from the exchange of angular momentum between the spin of electrons and other degrees of freedom in crystalline materials. Many degrees of freedom, such as magnetization(1) and mechanical motion(2) , have already been united into this exchange framework. However, the nuclear spin-a key angular momentum- has yet to be incorporated. Here we observe spin pumping from nuclear magnetic resonance (NMR), in which nuclear spin dynamics emits a spin current, a flow of spin angular momentum of electrons. By using the canted antiferromagnet MnCO3 , in which typical nuclear spin-wave formation is established due to the reinforced hyperfine coupling, we find that a spin current is generated from an NMR. Nuclear spins are indispensable for quantum information technology(3) and are also frequently used in various sensors, such as in magnetic resonance imagine(4). The observed NMR spin pumping allows spin-current generation from nuclei and will enable spintronic detection of nuclear spin states.