Effects of pixel groove depth and patterned permalloy assist film for the magnetization switching of LPE-garnet film were studied experimentally. The results showed that the magnetization field to switch a structured pixel could be reduced by controlling the pixel groove depth. It was also found that the permalloy assist film creates a unique pair-domain pattern within a single garnet pixel, which is useful for realizing a new type of magneto-optic spatial light modulator with high resistivity to noise.
A magneto-optic spatial light modulator (MOSLM) driven by electric field is presented. Using finite element method simulation, the parameters of the MOSLM are decided including the 1 µm piezoelectric lead zirconate titanate (PZT)-based layer, the 200 nm bottom electrode, and the 8V electrical applied voltage. A flat surface magneto-optical bismuth-substituted iron garnet (Bi:YIG) based film having an array-pixels structure was created by a site-selected epitaxial method on a SGGG-based substrate. In order to avoid high temperature annealing process which may damage the Bi:YIG film, the PZT film was deposited by the aerosol deposition method (ADM) on the Bi:YIG film. By stress field induced by the PZT film to the Bi:YIG film with an external magnetic field, the pixels of the device were successfully switched.
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