By measuring frequency dependence of photoinduced double peaks of disaccommodation, DA as a function of temperature was observed at very low frequency: 0.07～0.30 KHZ, in a single crystal of yttrium iron garnet, YIG with small amounts of Ca: 0.001, while only single peak existed at the higher frequency 0.5 kHz. The behavior is explained based on theoretical approach on a domain wall dynamics.
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