Angle-dependent resonant dynamics of stripes and skyrmions in Re/Co/Pt multilayers

The dynamic behavior and stabilization of skyrmions in magnetic multilayers are critical for advancing spintronic and magnonic technologies. In our study, we investigate the static and dynamic properties of [ Re / Co ( d Co ) / Pt ] 20 multilayers with varying Co thicknesses (6–24 Å), showcasing a transition from out-of-plane to in-plane magnetic anisotropy. The magnetization reversal leads to a transformation from labyrinth domains to skyrmion bubbles due to the interfacial Dzyaloshinskii-Moriya interaction (iDMI). Using angle-dependent imaging at remanence, we confirm that skyrmions can be stabilized without an external magnetic field at specific polar angles, with the stabilization angle increasing alongside the Co thickness. Ferromagnetic resonance spectroscopy reveals four distinct resonant modes, including low-frequency (2–18 GHz) and high-frequency (20–35 GHz) modes, depending on the magnetization texture. The frequency range of these modes narrows with decreasing effective anisotropy and the iDMI strength decreases in thicker Co layers in perpendicular configurations. These findings link between material properties and skyrmion dynamics directly and demonstrate the feasibility of tunable resonant modes for magnonic devices. By addressing both static and dynamic aspects, our work advances the development of next-generation spintronic and magnonic applications.