Parametric spin pumping into an antiferromagnetic insulator
Parametric spin pumping into an antiferromagnetic insulator
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参数自旋泵入反铁磁绝缘体
DOI：
10.1103/physrevb.100.144430
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发表时间：
2019
影响因子：
3.7
通讯作者：
Ando Kazuya
中科院分区：
文献类型：
--
作者：
Numata Taiki;Hayashi Hiroki;Sakimura Hiroto;Ando Kazuya
我们报道了利用短波长磁振子驱动的自旋抽运在反铁磁绝缘体中的自旋输运现象。在三层介质中，利用参量泵浦激发出短波长的磁振子。在thelayer中的参数激发的磁振子注入到NiO层，这是检测电使用的逆自旋霍尔效应在Pt层的自旋电流。我们发现，薄膜中参量激发磁振子的自旋抽运效率比薄膜中的小近一个数量级。通过插入NiO层引起的参数自旋泵浦效率的抑制与FMR自旋泵浦效率的抑制相当。我们进一步发现，NiO的插入对波数为的偶极交换磁振子的自旋抽运效率的抑制比对波数为的交换磁振子的抑制更显著.这种差异是由于两个磁振子散射和自旋钉扎由于反铁磁晶粒在NiO层。这些结果为理解反铁磁绝缘体中的自旋抽运提供了依据。
We report the observation of spin transport through antiferromagnetic insulators using spin pumping driven by short-wavelength magnons. The short-wavelength magnons are excited by parametric pumping in atrilayer. The parametrically excited magnons in thelayer inject a spin current into the NiO layer, which is detected electrically using the inverse spin Hall effect in the Pt layer. We found that the spin-pumping efficiency of the parametrically excited magnons in thefilm is nearly an order of magnitude smaller than that in thefilm. The suppression of the parametric spin-pumping efficiency induced by inserting the NiO layer is comparable to that of the FMR spin-pumping efficiency. We further found that the suppression of the spin-pumping efficiency due to the NiO insertion for the dipole-exchange magnons with the wave number ofis more significant than that for the exchange magnons with. This difference is attributed to two-magnon scattering and spin pinning due to antiferromagnetic grains in the NiO layer. These results provide insight into the understanding of the spin pumping into antiferromagnetic insulators.