Magnetic ordering and magnetoelectric coupling in a ferro-rotational frustrated magnet

Magnetic frustration can suppress conventional magnetic ordering and give rise to exotic magnetic states and emergent functionalities. In this study, we investigate the ferrorotational compound $\mathrm{RbFe}{(\mathrm{Se}{\mathrm{O}}_{4})}_{2}$ with strong magnetic frustration. Our results reveal a helical magnetic structure emerging below the N\'eel temperature ${T}_{N}\ensuremath{\sim}1.57$ K. Magnetic diffuse scattering above ${T}_{N}$ confirms short-range correlations. Magnetoelectric measurements demonstrate magnetoelectric coupling behavior below ${T}_{N}$. Monte Carlo simulations reproduce the experimental \ensuremath{\chi}-T and M-H curves and help extract effective exchange interactions. These findings position $\mathrm{RbFe}{(\mathrm{Se}{\mathrm{O}}_{4})}_{2}$ as a promising platform for studying the interplay between spin magnitude, dimensionality, frustration, magnetoelectric coupling, and exploring the crossover between classical and quantum magnetic regimes.