Huang Lin, Zhou Yongjian, Qiu Hongsong, Bai Hua, Chen Chong, Yu Weichao, Liao Liyang, Guo Tingwen, Pan Feng, Jin Biaobing, Song Cheng
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P. R. China.
Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing, 210023, P. R. China.
Adv Mater. 2022 Oct;34(42):e2205988. doi: 10.1002/adma.202205988. Epub 2022 Sep 19.
The inverse spin Hall effect (ISHE) is one of the accessible and reliable methods to detect spin current. The magnetization-dependent inverse spin Hall effect has been observed in magnets, expanding the dimension for spin-to-charge conversion. However, antiferromagnetic Néel-vector-dependent ISHE, which has been long time highly pursued, is still elusive. Here, ISHE in Mn Au/[Co/Pd] heterostructures is investigated by terahertz emission and spin Seebeck effect measurements, where [Co/Pd] possesses perpendicular magnetic anisotropy for out-of-plane polarized spin current generation and Mn Au is a collinear antiferromagnet for the spin-to-charge conversion. The out-of-plane spin polarization (σ ) is rotated toward in-plane by the Néel vectors in Mn Au, then the spin current is converted into charge current at two staggered spin sublattices. The ISHE signal is much stronger when the converted charge current is parallel to the Néel vector compared with its orthogonal counterpart. The Néel vector and resultant ISHE signals, which is termed as antiferromagnetic inverse spin Hall effect, can be switched. The finding not only adds a new member to the Hall effect family, but also makes antiferromagnetic spintronics more flexible.
逆自旋霍尔效应（ISHE）是检测自旋电流的一种可行且可靠的方法。在磁体中已观察到与磁化相关的逆自旋霍尔效应，拓展了自旋到电荷转换的维度。然而，长期以来备受关注的与反铁磁奈尔矢量相关的ISHE仍然难以捉摸。在此，通过太赫兹发射和自旋塞贝克效应测量研究了MnAu/[Co/Pd]异质结构中的ISHE，其中[Co/Pd]具有垂直磁各向异性以产生面外极化自旋电流，而MnAu是用于自旋到电荷转换的共线反铁磁体。面外自旋极化（σ）被MnAu中的奈尔矢量旋转至面内，然后自旋电流在两个交错的自旋子晶格处转换为电荷电流。与电荷电流与其奈尔矢量正交的情况相比，当转换后的电荷电流与奈尔矢量平行时，ISHE信号要强得多。奈尔矢量和由此产生的ISHE信号（被称为反铁磁逆自旋霍尔效应）可以被切换。这一发现不仅为霍尔效应家族增添了新成员，还使反铁磁自旋电子学更加灵活。
