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As one of the fundamental magnonic devices, a magnonic splitter device hasbeen proposed and spin wave propagation in this device has been studiednumerically and experimentally. In the present work, we fabricated a T-shapedmagnonic splitter with 6 $\mu$m-wide three arms using a 100 nm-thick yttriumiron garnet film and, using time-resolved magneto-optic Kerr microscopy,observed that spin waves split into both, the vertical and the horizontaldirection at the junction. Analyzing the results, we found that spin wave modesare converted into another during the splitting process and the splittingefficiency is dominantly dependent on the 1st order of incoming spin waves.

Spin wave mode conversion in an in-plane magnetized microscale T-shaped YIG magnonic splitter