SCIENCE CHINA Materials, Volume 64 , Issue 8 : 2029-2036(2021) https://doi.org/10.1007/s40843-020-1574-5

Giant spin torque efficiency in single-crystalline antiferromagnet Mn2Au films

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  • ReceivedOct 22, 2020
  • AcceptedNov 24, 2020
  • PublishedFeb 4, 2021



the Agency for Science

Technology and Research(A*STAR)

the Singapore Ministry of Education(MOE2018-T2-2-043)

and A*STAR IAF-ICP 11801E0036.


This work was supported by the Agency for Science, Technology and Research (A*STAR) of Singapore (A1983c0036), the Singapore Ministry of Education (MOE2018-T2-2-043), and A*STAR IAF-ICP 11801E0036.

Interest statement

The authors declare that they have no conflict of interest.

Contributions statement

Chen S prepared the samples. Chen S and Shu X designed and performed the measurements; Chen S, Shu X and Zhou J performed the data analysis; Chen S, Shu X and Chen J wrote and revised the paper. All authors contributed to the general discussion.

Author information

Shaohai Chen is a research fellow of the National University of Singapore. He received a PhD degree in 2016 from Fudan University. During 2014–2015, he was a joint-training PhD student at the National University of Singapore. His research interest focuses on high-anisotropy magnetic materials, 2D materials and spintronics.

Xinyu Shu received his Bachelor degree from Harbin Institute of Technology and Master degree from Beijing University of Technology. He is now a PhD candidate at the Department of Material Science and Engineering, National University of Singapore. His current research interest is spintronics in metallic, oxide and low dimension heterostructures.

Jingsheng Chen received his PhD degree from Lanzhou University, China, in 1999. He joined Nanyang Technological University as a post-doctor in 1999–2001 and the Data Storage Institute, A*STAR as research scientist in 2001–2007. In the year of 2007, he joined the National University of Singapore as an assistant professor and was promoted to associate professor in 2013. His research interest includes high-anisotropy magnetic materials, spintronics, multiferroic materials, and nanostructure magnetic materials.

Supplementary data

Supplementary information

Experimental details and supporting data are available in the online version of the paper.


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  • Figure 1

    (a, b) XRD spectra of the STO-sub and Si-sub samples, respectively. The schematic in (b) shows the sample structure.

  • Figure 2

    (a, b) ST-FMR spectra of the STO-sub and Si-sub samples with f ranging from 4 to 12 GHz, respectively. (c) Schematic and image of the device for the ST-FMR measurements. (d, e) The Vmix (circles) versus the Hex curves with f = 9 GHz and corresponding fitting results for the Si-sub and STO-sub samples, respectively. The dotted and dashed lines correspond to the contributions of VA and Vs, respectively. (f) The f versus Hres curves and corresponding fitting lines of the two samples with different substrates.

  • Figure 3

    (a) The dependence of ξDL on the in-plane angle φm of the STO-sub and MgO-sub samples. The insert schematic shows the relation between the φm and the [100] orientation of the substrate. The x-axis is parallel to the long side of the device strip. (b) The resistivities of the Mn2Au films deposited on different substrates. The insert schematic shows the dual magnetic easy axes directions of the (002)-oriented single-crystal Mn2Au film.

  • Figure 4

    (a) Schematic showing how the Mn2Au layer induces a spin current and forms torques on the MnGa layer. (b) The AHE measurement result of the sample. (c) The current induced magnetization switching results of the sample with different external magnetic fields Hx along the current direction. (d) The extracted critical switching current density Jc versus Hx curve from (c).

  • Table 1   Summary of the resistivity (ρxx), spin Hall conductivity (σSH) and effective SOT efficiency (ξDL) of the AFM materials with single-crystalline and polycrystalline structures of our work and recently reported results



    (µΩ cm)


    (103(ħ/2e) Ω−1 cm−1)



    Mn2Au (single-crystalline)




    This work

    Mn2Au (polycrystalline)




    This work

    Mn2Au (single-crystalline)





    IrMn (single-crystalline)





    IrMn (polycrystalline)





    IrMn3 (single-crystalline)





    IrMn3 (polycrystalline)





    PtMn (single-crystalline)





    PtMn (polycrystalline)





    PdMn (single-crystalline)






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