Universal Helimagnon and Skyrmion Excitations in Metallic, Semiconducting and Insulating Chiral Magnets

Nearly seven decades of research on microwave excitations of magnetic materials have led to a wide range of applications in electronics1,2,3,4. The recent discovery of topological spin solitons in chiral magnets, so-called skyrmions5,6,7,8,9, promises high-frequency devices that exploit the exceptional emergent electrodynamics of these compounds10,11,12,13,14. Therefore, an accurate and unified quantitative account of their resonant response is key. Here, we report all-electrical spectroscopy of the collective spin excitations in the metallic, semiconducting and insulating chiral magnets MnSi, Fe1-xCoxSi and Cu2OSeO3, respectively, using broadband coplanar waveguides. By taking into account dipolar interactions, we achieve a precise quantitative modelling across the entire magnetic phase diagrams using two material-specific parameters that quantify the chiral and the critical field energy. The universal behaviour sets the stage for purpose-designed applications based on the resonant response of chiral magnets with tailored electric conductivity and an unprecedented freedom for an integration with electronics.     «

Nearly seven decades of research on microwave excitations of magnetic materials have led to a wide range of applications in electronics1,2,3,4. The recent discovery of topological spin solitons in chiral magnets, so-called skyrmions5,6,7,8,9, promises high-frequency devices that exploit the exceptional emergent electrodynamics of these compounds10,11,12,13,14. Therefore, an accurate and unified quantitative account of their resonant response is key. Here, we report all-electrical spectroscopy of...     »