Novel physical properties in ferro-rotational magnets

Ferro-Rotation (FR), stemming from the crystallographic rotational distortions, has garnered considerable attention due to its distinctive physical characteristics. Nevertheless, the correlation between FR and magnetic order remains inadequately comprehended. In this presentation, we delve into the intricate interplay between magnetic order and FR, identify potential magnetic materials capable of accommodating magnetic FR, and explore their interaction with external stimuli. Specifically, we will present our recent findings regarding a FR magnet, RbFe(SO4)2. Utilizing polarized neutron diffraction, we have determined that below 4.0 K, the spins in RbFe(SO4)2 adopt a 120˚ configuration within the ab plane and exhibit a helical structure along the c-axis. Strikingly, an external electric field can induce a single magnetic domain state in the crystal while simultaneously controlling its inherent magnetic chirality. In summary, this research elucidates the intricate relationship between FR, magnetic order, and external perturbations, unveiling the untapped potential and functionalities of magnetic FR materials.