Shiota Yoichi, Taniguchi Tomohiro, Hayashi Daiju, Narita Hideki, Karube Shutaro, Hisatomi Ryusuke, Moriyama Takahiro, Ono Teruo
Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan.
Center for Spintronics Research Network, Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan.
Nat Commun. 2024 Nov 20;15(1):9750. doi: 10.1038/s41467-024-54125-0.
Antiferromagnetic magnons possess a distinctive feature absent in their ferromagnetic counterparts: the presence of two distinct handedness modes, the right-handed (RH) and left-handed (LH) precession modes. The magnon handedness determines the sign of spin polarization carried by the propagating magnon, which is indispensable for harnessing the diverse functionalities in magnonic devices, such as data encoding, magnon polarization-based logic systems, and quantum applications involving magnons. However, the control of coherently propagating magnon handedness in antiferromagnets has remained elusive. Here we demonstrate the manipulation and electrical readout of propagating magnon handedness in perpendicularly magnetized synthetic antiferromagnets (SAF). We find that the antiferromagnetic magnon handedness can be directly identified by measuring the inverse spin Hall effect (ISHE) voltage, which arises from the spin pumping effect caused by the propagating antiferromagnetic magnons in the SAF structure. The RH and LH modes of the magnon can be distinguishable when the SAF structure is sandwiched by heavy metals with the same sign of spin Hall angle. This work unveils promising avenues for harnessing the unique properties of antiferromagnetic magnons.
存在两种不同的手性模式，即右手（RH）和左手（LH）进动模式。磁振子的手性决定了传播磁振子所携带的自旋极化的符号，这对于利用磁振子器件中的各种功能（如数据编码、基于磁振子极化的逻辑系统以及涉及磁振子的量子应用）是不可或缺的。然而，在反铁磁体中对相干传播的磁振子手性的控制仍然难以实现。在此，我们展示了在垂直磁化的合成反铁磁体（SAF）中对传播磁振子手性的操纵和电学读出。我们发现，反铁磁磁振子的手性可以通过测量逆自旋霍尔效应（ISHE）电压直接识别，该电压源于SAF结构中传播的反铁磁磁振子引起的自旋泵浦效应。当SAF结构被具有相同自旋霍尔角符号的重金属夹在中间时，磁振子的RH和LH模式可以区分开来。这项工作为利用反铁磁磁振子的独特性质开辟了有前景的途径。
