Giant anomalous transverse transport properties of Co-doped two-dimensional Fe₃GaTe₂

Abstract

In spintronics, transverse anomalous transport properties have emerged as a highly promising avenue surpassing the conventional longitudinal transport behaviors. Here, we explore the transverse transport properties of monolayer and bilayer Fe_3−xCo_xGaTe₂ (x = 0.083, 0.167, 0.250, and 0.330) systems. All the systems exhibit ferromagnetic ground states with metallic features and also have perpendicular magnetic anisotropy. Besides, the magnetic anisotropy is substantially enhanced with increasing Co-doping concentration. However, unlike magnetic anisotropy, the Curie temperature is suppressed by increasing the Co-doping concentration. For instance, the monolayer and bilayer Fe_2.917Co_0.083GaTe₂ hold a Curie temperature of 253 K and 269 K, which decreases to 163 K and 173 K in monolayer and bilayer Fe_2.67Co_0.33GaTe₂ systems, respectively. We find a giant anomalous Nernst conductivity (ANC) of 6.03 A/(K·m) in the monolayer Fe_2.917Co_0.083GaTe₂ at −30 meV, and this is further enhanced to 11.30 A/(K·m) in the bilayer Fe_2.917Co_0.083GaTe₂ at −20 meV. Moreover, the bilayer Fe_2.917Co_0.083GaTe₂ structure has a large anomalous thermal Hall conductivity (ATHC) of −0.14 W/(K·m) at 100 K. Overall, we find that the Fe_3−xCo_xGaTe₂ (x = 0.083, 0.167, 0.250, and 0.330) structures have better anomalous transverse transport performance than the pristine Fe₃GaTe₂ system and can be used for potential spintronics and spin caloritronics applications.

Graphical abstract

Keywords

two-dimensional (2D) material / Fe₃GaTe₂ / ferromagnetism / magnetic anisotropy / Curie temperature / anomalous Hall conductivity / anomalous Nernst conductivity / anomalous thermal Hall conductivity

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Declarations

The authors declare that they have no competing interests and there are no conflicts.

Author contributions

J. H. conceived the idea of this study; I. K. performed DFT calculations; J. H. and I. K. wrote and revised the manuscript.

Electronic supplementary materials

The online version contains supplementary material available at https://doi.org/10.1007/s11467-024-1424-5 and https://journal.hep.com.cn/fop/EN/10.1007/s11467-024-1424-5. Supporting information includes the information about different random site Co doping in bilayer Fe_3−xCo_xGaTe₂, phonon dispersion curves for monolayer Fe_3−xCo_xGaTe₂, average local magnetic moments in bilayer Fe_3−xCo_xGaTe₂, spin projected band structures including SOC for monolayer and bilayer systems, MAE contributions, temperature dependent magnetization curves, thickness-dependent longitudinal conductivity, and Barry curvature along high symmetry lines for monolayer and bilayer Fe_3−xCo_xGaTe₂ systems.

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2022R1A2C1004440) and the Supercomputing Center/Korea Institute of Science and Technology Information with supercomputing resources including technical support (KSC-2023-CRE-0190).

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