Frédéric Bonell I Molecular beam epitaxy of 2D magnets and magnetic van der Waals heterostructures for spintronics

Frédéric Bonell (Spintec-Grenoble)

The recent discovery of van der Waals 2D magnets has opened exciting opportunities to explore low dimensionality magnetism, proximity phenomena in heterostructures and all-van der Waals spintronics [1]. While most research in this area is currently performed with nanoflakes mechanically exfoliated from bulk crystals, molecular beam epitaxy is emerging as a powerful method to grow large-area 2D materials with fine tuning of the composition and control of the thickness down to the 2D limit.

I will review our recent progress in the fabrication of 2D magnets by molecular beam epitaxy, including diluted 2D semiconductors [2], 2D metallic alloys [3] and (Fe,Co)_NGeTe₂ intrinsic ferromagnets [4]. I will also present an example of epitaxial van der Waals heterostructure in which a 2D magnet is associated to a topological insulator. In such an heterostructure, large spin-orbit torques are observed, enabling current-driven magnetization switching [5].

REFERENCES

[1] Kurebayashi et al. Nature Rev. Phys. 4, 150 (2022)

[2] M. Gay et al., Compt. Rend. Phys. 22, 1 (2021) ; P. Mallet et al., Phys. Rev. Lett. 125, 036802 (2020)

[3] E. Velez et al., ACS Appl. Elec. Mater. 4, 259 (2022) ; E. Velez et al., Phys. Rev. B 106, 075432 (2022)

[4] M. Ribeiro et al., npj 2D Mater. Appl. 6, 10 (2022)

[5] T. Guillet et al., arXiv:2302.01101

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