Abstract
We discuss how the collective magnetic resonance response of the monoaxial chiral helimagnetic crystal ${\mathrm{CrNb}}_{3}{\mathrm{S}}_{6}$ can be tailored by changing the area of its magnetization plane. Micrometer-sized samples of this crystal yield a number of resonance modes occurring at frequencies ranging from 15 to 20 GHz, even in the absence of a magnetic field. Changes in the resonance bandwidth, of the order of several GHz, are attributed to the effect of the spatially nonuniform demagnetization fields on standing spin wave modes. This material hosts a chiral spin soliton lattice phase, whose field robustness, degree of controllability, and the relatively unexplored polarization-dependent microwave absorption make way for novel microwave applications.
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