The chiral magnets with topological spin textures provide a rare platform to explore topology and magnetism for potential application implementation.Here,we study the magnetic dynamics of several spin configurations o...The chiral magnets with topological spin textures provide a rare platform to explore topology and magnetism for potential application implementation.Here,we study the magnetic dynamics of several spin configurations on the monoaxial chiral magnetic crystal MnNb_(3)S_(6)via broadband ferromagnetic resonance(FMR)technique at cryogenic temperature.In the high-field forced ferromagnetic state(FFM)regime,the obtained frequency f vs.resonance field H_(res) dispersion curve follows the wellknown Kittel formula for a single FFM,while in the low-field chiral magnetic soliton lattice(CSL)regime,the dependence of H_(res) on magnetic field angle can be well-described by our modified Kittel formula including the mixture of a helical spin segment and the FFM phase.Furthermore,compared with the sophisticated Lorentz micrograph technique,the observed magnetic dynamics corresponding to different spin configurations allow us to obtain temperature-and field-dependent proportion of helical spin texture and helical spin period ratio L(H)/L(0)via our modified Kittel formula.Our results demonstrated that fieldand temperature-dependent nontrivial magnetic structures and corresponding distinct spin dynamics in chiral magnets can be an alternative and efficient approach to uncovering and controlling nontrivial topological magnetic dynamics.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11774150,12074178,12004171,12074386,and11874358)Applied Basic Research Programs of Science and Technology Commission Foundation of Jiangsu Province,China(Grant No.BK20170627)+1 种基金Open Research Fund of Jiangsu Provincial Key Laboratory for NanotechnologyScientific Foundation of Nanjing University of Posts and Telecommunications(NUPTSF)(Grant No.NY220164)。
文摘The chiral magnets with topological spin textures provide a rare platform to explore topology and magnetism for potential application implementation.Here,we study the magnetic dynamics of several spin configurations on the monoaxial chiral magnetic crystal MnNb_(3)S_(6)via broadband ferromagnetic resonance(FMR)technique at cryogenic temperature.In the high-field forced ferromagnetic state(FFM)regime,the obtained frequency f vs.resonance field H_(res) dispersion curve follows the wellknown Kittel formula for a single FFM,while in the low-field chiral magnetic soliton lattice(CSL)regime,the dependence of H_(res) on magnetic field angle can be well-described by our modified Kittel formula including the mixture of a helical spin segment and the FFM phase.Furthermore,compared with the sophisticated Lorentz micrograph technique,the observed magnetic dynamics corresponding to different spin configurations allow us to obtain temperature-and field-dependent proportion of helical spin texture and helical spin period ratio L(H)/L(0)via our modified Kittel formula.Our results demonstrated that fieldand temperature-dependent nontrivial magnetic structures and corresponding distinct spin dynamics in chiral magnets can be an alternative and efficient approach to uncovering and controlling nontrivial topological magnetic dynamics.
