Dohi, T.; Bhukta, M.; Kammerbauer, F.; Krishna, V.; Zarzuela, R.; Sud, A.; Syskaki, M.-A.; Minh Tran, D.; Denneulin, T.; Wintz, S.; Weigand, M.; Finizio, S.; Raabe, J.; Frömter, R.; Dunin-Borkowski, R.E.; Sinova, J.; Kläui, M.: Observation of a non-reciprocal skyrmion Hall effect of hybrid chiral skyrmion tubes in synthetic antiferromagnetic multilayers. Nature Communications 16 (2025), p. 8285/1-11
10.1038/s41467-025-63759-7
Open Accesn Version
Abstract:
A hybrid chiral skyrmion tube is a well-known example of a 3D topological spin texture, exhibiting an intriguing chirality transition along the thickness direction. This transition progresses from left-handed to right-handed Néel-type chirality, passing through a Bloch-type intermediate state. Such an exotic spin configuration potentially exhibits distinctly different dynamics from that of the common skyrmion tube that exhibits a homogeneous chirality; yet these dynamics have not been ascertained so far. Here, we reveal the distinct features of current-induced dynamics that result from the hybrid chiral skyrmion tube structure in synthetic antiferromagnetic (SyAFM) multilayers. Strikingly, the SyAFM hybrid chiral skyrmion tubes exhibit a non-reciprocal skyrmion Hall effect in the flow regime. The non-reciprocity can even be tuned by the degree of magnetic compensation in the SyAFM systems. Our theoretical modeling qualitatively corroborates that the non-reciprocity stems from the dynamic oscillation of skyrmion helicity during its current-induced motion. The findings highlight the critical role of the internal degrees of freedom of these complex skyrmion tubes for their current-induced dynamics.