Robust formation of nanoscale magnetic skyrmions in easy-plane thin film multilayers with low damping

Abstract

We experimentally demonstrate the formation of room-temperature skyrmions with radii of about 25\,nm in easy-plane anisotropy multilayers with interfacial Dzyaloshinskii-Moriya interaction (DMI). We detect the formation of individual magnetic skyrmions by magnetic force microscopy and find that the skyrmions are stable in out-of-plane fields up to about 200 mT. We determine the interlayer exchange coupling as well as the strength of the interfacial DMI. Additionally, we investigate the dynamic microwave spin excitations by broadband magnetic resonance spectroscopy. From the uniform Kittel mode we determine the magnetic anisotropy and low damping ${\alpha }_{\mathrm{G}}<0.04$. We also find clear magnetic resonance signatures in the non-uniform (skyrmion) state. Our findings demonstrate that skyrmions in easy-plane multilayers are promising for spin-dynamical applications.

References in corpus (9)

• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
• Skyrmion Hall Effect Revealed by Direct Time-Resolved X-Ray Microscopy
• Creep and flow regimes of magnetic domain wall motion in ultrathin Pt/Co/Pt films with perpendicular anisotropy
• Skyrmion fractionalization and merons in chiral magnets with easy-plane anisotropy
• Tailoring magnetic energies to form dipole skyrmions and skyrmion lattices
• Microwave resonances of magnetic skyrmions in thin film multilayers
• Skyrmions in antiferromagnets: thermal stability and the effect of external field and impurities
• Magnetization Reversal Signatures of Hybrid and Pure Néel Skyrmions in Thin Film Multilayers

Cited by in corpus (5)

• Roadmap on Spin-Wave Computing
• Emergent Self-propulsion of Skyrmionic Matter in Synthetic Antiferromagnets
• Anisotropic skyrmion crystal on a centrosymmetric square lattice under an in-plane magnetic field
• Planar scanning probe microscopy enables vector magnetic field imaging at the nanoscale
• Resonant dynamics of skyrmion lattices in thin film multilayers: Localised modes and spin wave emission