Chiral Magnetic Texture and Spin Dynamics in Magnetic Superlattices*

Chiral magnetic textures, in particular magnetic skyrmions, are attractive for data storage and processing via magnetic “racetracks” and logic gates. These textures may also be used as neurotransmitters in artificial neural networks for non-conventional computing. For such applications, thin-film, all-metallic magnetic heterostructures with chiral texture stabilized by interfacial Dzyaloshinskii-Moriya interaction (iDMI) are ideal candidates.
Here, we investigate magnetic superlattices based on the low-damping and high saturation magnetization binary alloy Co₂₅Fe₇₅ (CoFe) [1,2]. The formation of circular magnetic texture is confirmed by magnetic force microscopy. This texture has a stable sub-100 nm diameter in a field range of about 140 mT, indicating the formation of iDMI-stabilized magnetic skyrmions. The relatively low damping of the superlattice spin dynamics is confirmed by broadband ferromagnetic resonance measurements.

[1] M. A. W. Schoen, Nat. Phys 12, 839 (2016).
[2] L. Flacke, Appl. Phys. Lett. 115, 122402 (2019).