Ionic liquid gating control of planar Hall effect in Ni80Fe20/HfO2 heterostructures

Ionic liquid gating control of planar Hall effect in Ni₈₀Fe₂₀/HfO₂ heterostructures

Wang Yang-Ping^{1, 2}, Liu Fu-Fu^{1, 2}, Zhou Cai³, Jiang Chang-Jun^{1, 2, †}

(a) Schematic diagram of O^2– migration under positive gate voltage. O^2– is represented by a red solid circle, and the arrow indicates the direction in which it moves. (b) A schematic diagram of measuring ferromagnetic resonance (FMR). (c) The FMR differential spectrum measured by FMR at different gate voltages, the inset is the FMR integral spectrum. (d) The regulation diagram of the resonance field H_r when the 4-V gate voltage is applied and removed repeatedly.