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 electronics(1-4). The recent discovery of topological spin solitons in chiral magnets, so-called skyrmions(5-9), promises high-frequency devices that exploit the exceptional emergent electrodynamics of these compounds(10-14). 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.


Published in:
Nature Materials, 14, 5, 478-483
Year:
2015
Publisher:
London, Nature Publishing Group
ISSN:
1476-1122
Keywords:
Laboratories:




 Record created 2015-05-29, last modified 2018-03-18


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