Electrical Control of Spin-Mixing Conductance in a Y 3 Fe 5 O 12 / Platinum Bilayer

In designing spintronic devices, control of spin-current transport at the interface of a magnetic material and a normal metal is key. In general, spin current in metallic materials is limited to the nanometer scale by the spin diffusion length. Using an ionic-gating technique, this study experimentally demonstrates control of the spin current due to spin pumping in a yttrium-iron-garnet/Pt bilayer using a gate voltage. This result helps to better understand spin transfer at magnetic-insulator/heavy-metal interfaces, and therefore enables improved spintronic devices.