Figure 3: Variation of magnetic domain structure by the modulation microwave from arbitrary initial states.
From: Adaptive microwave impedance memory effect in a ferromagnetic insulator
(a) Optical image of the YIG thin film (indicated by white dashed line). (b) Illustrations of the experimental setup and axes, where the polarization direction of the H-MWNF is parallel to the LO-axis, and the positive and negative transverse MOKE signal (TR-MO) correspond to magnetic moments whose polarization directions are parallel and anti-parallel to the TR-axis, respectively. (c,d) Magnetic domain images measured at the initial (c) and the modulated (d) states, where the fm=1.0 GHz. (e) Difference of absolute TR-MO (Δ|TR-MO|) intensity between the initial and the modulated states. (f) Averaged Δ|TR-MO| distribution for various fm, where the positive sign of Δ|TR-MO| correspond to a population of magnetic moment whose polarization direction is perpendicular to the LO-axis. (g) Averaged |TR-MO| intensities measured at the initial (red) and modulated (black) states as a function of fm, where the measurements were conducted 20 times with refreshing the initial states for each fm. (h) Detailed MD structures of the initial and the modulated states at fm=1.0 GHz, where the traces of initial MDs that remain after the modulation are indicated by red lines. (i) Real and imaginary parts of ΔS21,p corresponding to the MD structures (black: state #1; red: state #2; green: state #3). In addition, averaged ΔS21,p at fm=1.0 GHz (blue) and fm=1.4 GHz (cyan) are also presented for the comparison.
