Giant room-temperature nonvolatile magnon on–off modulation ratio in a multiferroic Pt/Bi1.05La0.05FeO3/Pt sandwiched structure

We experimentally demonstrated magnon transmission in a vertical geometry consisting of multiferroic Bi1.05La0.05FeO3 (BLFO) and heavy-metal Pt layers. Notably, a giant nonvolatile on–off modulation ratio of ∼120% under zero-field operation, together with high magnon drag efficiency (∼3.51 × 10−3 V A−1), was observed in a vertical Pt/BLFO/Pt device at room temperature. The magnon-mediated drag effect in the nonlocal Pt/BLFO/Pt symmetrical layers was investigated via the magnetic field, angle, and current density dependence. The intrinsic giant on–off modulation of the magnon signal, along withnonvolatile transport under zero-field operation and polarization-controlled Néel vectors of multiferroics, moves a possible step toward the practical utilization of multiferroic vertical magnon devices. This work may contribute to magnonic transport with high-speed, miniaturization and ultralow energy consumption.