1Key Laboratory for Magnetism and Magnetic Materials (Ministry of Education), Lanzhou University, Lanzhou 730000, China 2Key Laboratory of Special Function Materials and Structure Design (Ministry of Education), Lanzhou University, Lanzhou 730000, China 3Institute of Electronic Materials, Lanzhou University, Lanzhou 730000, China
Abstract：We report that the ferromagnetic resonance (FMR) response of the CoFeB/HfO$_{2}$ heterostructures is stabilized and reversibly manipulated by ionic gel. Ionic gel with excellent flexibility is used as a medium to form an electric field. When a 4 V gate voltage is applied, the resonance field $H_{\rm r}$ and peak-to-peak linewidth $\Delta H_{\rm pp}$ at different angles are regulated. When $\theta = 20^{\circ}$, the $H_{\rm r}$ is regulated up to 82 Oe. When $\theta = 70^{\circ}$, $\Delta H_{\rm pp}$ is tuned up to 75 Oe. When the gate voltage is repeatedly applied, the FMR spectra can be freely switched between the initial state and the gated state. Our study provides an effective method to manipulate the damping of the magnetic film stably and reversibly.
2020, Vol. 37 
