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Article Dans Une Revue Nano Letters Année : 2023

Evidence of Strong Dzyaloshinskii–Moriya Interaction at the Cobalt/Hexagonal Boron Nitride Interface

Banan El-Kerdi
André Thiaville
Stanislas Rohart
Sujit Panigrahy
Joao Sampaio
Alexandra Mougin

Résumé

The Dzyaloshinskii−Moriya interaction (DMI) and perpendicular magnetic anisotropy (PMA) were measured on four series of Co films (1−2.2 nm thick) grown on Pt or Au and covered with h-BN or Cu. Clean h-BN/Co interfaces were obtained by exfoliating h-BN and transferring it onto the Co film in situ in the ultra-high-vacuum evaporation chamber. By comparing h-BN and Cu-covered samples, the DMI induced by the Co/h-BN interface was extracted and found to be comparable in strength to that of the Pt/Co interface, one of the largest known values. The strong observed DMI despite the weak spin−orbit interaction in h-BN supports a Rashba-like origin in agreement with recent theoretical results. Upon combination of it with Pt/Co in Pt/Co/h-BN heterostructures, even stronger PMA and DMI are found which stabilizes skyrmions at room temperature and a low magnetic field.
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Dates et versions

hal-04127377 , version 1 (13-06-2023)

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Banan El-Kerdi, André Thiaville, Stanislas Rohart, Sujit Panigrahy, Nuno Brás, et al.. Evidence of Strong Dzyaloshinskii–Moriya Interaction at the Cobalt/Hexagonal Boron Nitride Interface. Nano Letters, 2023, 23 (8), pp.3202-3208. ⟨10.1021/acs.nanolett.2c04985⟩. ⟨hal-04127377⟩
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