Electrically Induced Redox Reaction Driven Magnon Field Effect Transistor

Spin waves (SWs) stand out as one of the most promising candidates for post-complementary metal-oxide semiconductor (CMOS) computing devices owing to their data transmission capability that is devoid of Joule heating and their inherent wave nature. However, realizing an electric-field-based, energy-efficient, and scalable control mechanism for both SW amplitude (corresponding to Gilbert damping) and frequency (corresponding to magnetization) remains an unaccomplished goal, which hinders their application as transistors. Through this study, we present an innovative approach centered around an electric-field-controlled dynamic redox reaction, aiming to manipulate SW amplitude and resonance frequency in a ferrimagnetic yttrium iron garnet (Y3Fe5O12, YIG) within a Au/poly(3,4 ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS)/Pt/YIG heterostructure. In this proposed model, the applied electric field facilitates oxidation and reduction processes within PEDOT:PSS, triggering inversion and depletion of charge carriers within the Pt layer. This cascading effect subsequently modifies the spin-orbit interaction of Pt by displacing d-orbital energies both upward and downward. This phenomenon is proposed to affect spin pumping and spin relaxation from YIG to Pt under ferromagnetic resonance conditions, resulting in Gilbert damping and manipulation of magnetization within the YIG layer.