Compensation walls in gallium and aluminum substituted gadolinium–bismuth–iron garnet films created by laser annealing: Measurements and simulations

Abstract

Magnetic garnet films of composition (Gd 2 Bi 1) (Fe 4.3 Ga 0.2 Al 0.5) O 12 are grown by liquid phase epitaxy on ͑111͒ oriented substrates of gadolininium-gallium-garnet close to magnetic compensation. Local compensation walls ͑CW͒ are fabricated by laser annealing. Images of parallel and antiparallel compensation walls and of Bloch walls in annealed regions are obtained by magnetic force microscopy ͑MFM͒. The MFM signals associated with the CWs turned out to be smaller in amplitude but broader in space than the signals created by Bloch walls. To simulate the experimental results a theoretical model is developed taking into account the broadening of the CW by the preparation technique. Very good agreement between measurements and numerical simulations is obtained.

Reflectionless magnetic-to-optical differential modulator based on gyroelectric material

“…We find that the influence of the continuous varying magnetic field on the performance of the modulator is negligible as long as the transition of the magnetic field between two GEMs is sharp enough. By applying a local magnetic field [26] or using laser annealing in experiments, the sharp transition of magnetic field in GEMs can be obtained [27].…”