Figure 3
Electric-field control of magnetic anisotropy characterized by Rot-MOKE method.
(a) Configuration of the Rot-MOKE measurement and the definition of rotation angles (φ is the angle between the magnetization and the easy axis, θ is the angle between the external magnetic field and the easy axis). Dashed rectangle in (a) indicates the deformation of the sample under an electric field. (b) Calculated magnetic torque moment with E = 17.5 kV/cm (red circle) and E = 0 (black square) as a function of angle φ. (c) Polar graph of uniaxial anisotropy energy with E = 17.5 kV/cm on (red circle) and off (black square). (d) Amplitude of uniaxial magnetic anisotropy field (black sphere) and direction of the easy axis (blue rhombus) change with electric field, where φ0 is the angle between the easy axis and the [100] direction. The colored curves in (b) and (c) are the theoretical results fitted from the experimental data and error bars in (d) also come from the fitted values.
