Masuda Hidetoshi, Seki Takeshi, Ohe Jun-Ichiro, Nii Yoichi, Masuda Hiroto, Takanashi Koki, Onose Yoshinori
Institute for Materials Research, Tohoku University, Sendai, Japan.
Department of Physics, Toho University, Funabashi, Japan.
Nat Commun. 2024 Mar 7;15(1):1999. doi: 10.1038/s41467-024-46326-4.
Helimagnetic structures, in which the magnetic moments are spirally ordered, host an internal degree of freedom called chirality corresponding to the handedness of the helix. The chirality seems quite robust against disturbances and is therefore promising for next-generation magnetic memory. While the chirality control was recently achieved by the magnetic field sweep with the application of an electric current at low temperature in a conducting helimagnet, problems such as low working temperature and cumbersome control and detection methods have to be solved in practical applications. Here we show chirality switching by electric current pulses at room temperature in a thin-film MnAu helimagnetic conductor. Moreover, we have succeeded in detecting the chirality at zero magnetic fields by means of simple transverse resistance measurement utilizing the spin Berry phase in a bilayer device composed of MnAu and a spin Hall material Pt. These results may pave the way to helimagnet-based spintronics.
螺旋磁结构中，磁矩呈螺旋有序排列，具有一种称为手性的内部自由度，它对应于螺旋的旋向。这种手性似乎对干扰相当稳健，因此在下一代磁存储器方面很有前景。虽然最近通过在低温下对导电螺旋磁体施加电流进行磁场扫描实现了手性控制，但在实际应用中，仍需解决诸如工作温度低以及控制和检测方法繁琐等问题。在此，我们展示了在室温下通过电流脉冲在薄膜MnAu螺旋磁导体中实现手性切换。此外，我们利用由MnAu和自旋霍尔材料Pt组成的双层器件中的自旋贝里相位，通过简单的横向电阻测量成功在零磁场下检测到手性。这些结果可能为基于螺旋磁体的自旋电子学铺平道路。
