Modulated magnetic and piezoresponse phase by applied electric field in 2D layered materials at room temperature

• 2D layered hybrid perovskite (C 4 H 9 NH 3 ) 2 PbIBr 3 shows room-temperature magnetoelectric coupling. • The mixed halide based 2D layered perovskite was fabricated by a novel antisolvent method. • Ferromagnetism and piezoelectricity controlled by harmonizing ferroic orders. • Electric-field modulation enables magnetic domain rotation in hybrid perovskites. • Findings enable multifunctional applications in advanced electronic and spintronic devices. A hybrid perovskite material with a Two-dimensional (2D) layered (C 4 H 9 NH 3 ) 2 PbIBr 3 crystal structure is presented that exhibits magnetoelectricity and piezoelectricity coupling properties at room temperature. The interaction between ferromagnetism and piezoelectricity was achieved by harmonizing their respective ferroic orders. 2D layered organic–inorganic hybrid perovskites demonstrated controlled multifunctional ferroic attributes, with each characteristic established. The magnetic and piezoresponse phase rotation was controlled by modulating the electric-field strength using the magnetoelectricity and piezoelectricity. The responsive and phase-controllable behavior of ferromagnetism and piezoelectricity in 2D hybrid perovskites was effectively managed by an external electric field induced by the coupling between ferroic orders at room temperature. This discovery offers a promising avenue for future research on hybrid perovskites with novel 2D layered-crystal structure.