Scatter Plot from Scientific Research

Dispersion relations for spin-wave waveguides of different widths, created with an implantation dose of 2.5 pC µm -2 and measured at an external magnetic field of 50 mT. The cross-section of the waveguide on top depicts the distribution of amorphous and crystalline YIG. Dark blue areas denote amorphous YIG, while the rest is crystalline YIG. The superimposed heatmap visualizes the spatial distribution of the first waveguide mode (n = 1). With increasing dose, a larger part of the YIG gets amorphized, causing a downshift in frequency of the spin-wave dispersion relations. The negligible saturation magnetization of the amorphous regions gives rise to a demagnetizing field (H demag) in the waveguide (middle images), whose magnitude depends on the depth of the amorphized YIG. Coloured solid lines in the bottom images denote mumax 3 simulations of the waveguide structures. The width of the simulated waveguides is set 100 nm smaller than the nominal waveguide width to account for the effective narrowing of the waveguide due to the implantation profile of the ions.

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