Phys.org June 20, 2022
A chiral spin soliton lattice (CSL) exhibits reconfigurability in periodicity over a macroscopic length scale. Such coherent and tunable characteristics of the CSL lead to an emergence of elementary excitation of the CSL and bring a controllability of the dispersion relation of the CSL phonon. An international team of researchers (Japan, Canada, Russia, Germany) used a broadband microwave spectroscopy technique, and directly found that higher-order magnetic resonance modes appear in the CSL phase of a chiral helimagnet CrNb3S6, which is ascribed to the CSL phonon response. The resonance frequency of the CSL phonon can be tuned between 16 and 40 GHz in the vicinity of the critical field, where the CSL period alters rapidly. The frequency range of the CSL phonon is expected to extend over 100 GHz as extrapolated based on the theoretical model. Current results indicate that chiral helimagnets could work as materials useful for broadband signal processing in the millimeter-wave band…read more. TECHNICAL ARTICLE
(a) and (b) Schematic illustrations of a chiral spin soliton lattice (CSL) in the presence of the magnetic field H applied in the direction perpendicular to the c axis of the crystal. Credit: Phys. Rev. Lett. 128, 247203, 17 June 2022Â