Switching behavior of the magnetic resonance in a monoaxial chiral magnetic crystal CrNb3S6

We report broadband microwave spectroscopy in micrometer-sized platelet devices of a monoaxial chiral magnetic crystal CrNb3S6 with a helical c axis perpendicular to the device plane. In this device configuration, we found that the resonance of a chiral spin soliton lattice is insensitive to the direction of magnetic field H. In contrast to such behavior, resonance signals were largely suppressed in the ferromagnetic phase when the direction of H is parallel to a dominant component of the driving microwave field. Thus, by interchanging between the chiral spin soliton lattice and ferromagnetic phases, the microwave resonance can be switched on and off. The present device configuration allows us to demonstrate a switching performance, together with discrete changes in the resonance frequency by changing the H strength.