Abstract
Chiral magnetic soliton (CMS), an isolated topological kink consisting of spins, has potential applications in spintronics. In this work, the microwave response of layered MnNb3S6, which is suggested as a candidate for CMS, is investigated by the electronic spin resonance (ESR). Angle-dependent ESR spectra show that the microwave response is strong for H ⊥ c while it is weak for H//c, where c is the c-axis of the single crystal. When H ⊥ c, two resonance lines are observed, which are marked as Hr1 for the higher field and Hr2 for the lower field. It is determined that Hr1 originates from the ferromagnetic resonance of forced ferromagnetic moments, which evolves into paramagnetic resonance above TC. Meanwhile, Hr2 existing only below TC fulfills the Goldstone excitation of CMS. The microwave response of MnNb3S6 supports the existence of CMS in MnNb3S6, and is proved to be an effective means for modulating and investigating CMS.
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