Dzyaloshinskii–Moriya Interaction in Fe 5 GeTe 2 Epitaxial Thin Films
Résumé
Van der Waals ferromagnets, such as Fe 5 GeTe 2 , offer a promising platform for spintronic devices based on chiral magnetic textures, provided a significant Dzyaloshinskii-Moriya interaction (DMI) can be induced to stabilise the textures. Here, we directly measure DMI in epitaxial Fe 5 GeTe 2 thin films using Brillouin light scattering spectroscopy and observe a consistent DMI (D = 0.04 mJ/m 2 ) across various thicknesses. Its weak thickness dependence, combined with the nominally symmetric film interfaces, suggests a bulk origin. Although we do not determine the microscopic mechanism, our findings are compatible with ab initio calculations linking DMI to partial ordering of Fe split sites. Additionally, we find a low magnetic dissipation (α < 0.02). The observed DMI, which could be further enhanced by optimising the Fe site ordering, combined with low dissipation, makes Fe 5 GeTe 2 a strong candidate for exploring the dynamics of chiral magnetic textures in two-dimensional materials.
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