Fig. 2
From: Long-distance propagation of short-wavelength spin waves
Propagating short-wavelength spin waves and their group velocities. a Sketch of a YIG/Ti/Co heterostructure-based device for spin-wave propagation measurements. The external field H is in the plane and parallel to the Co nanowires. b Color-coded transmission spectra S21 measured on a YIG/Ti/Co device with a nanowire period of 200 nm (device A1). The field is set to −3000 Oe first and then swept from 600 Oe to 1000 Oe with a field step of 2.5 Oe. c A line plot extracted as a cutoff from b at the field value of 800 Oe. Δf is extracted for the calculation of the group velocity. d Group velocities of different spin-wave modes. Black squares show the group velocities of CPW-excited spin waves in the 20-nm-thick plain YIG film extracted from the experimental data on a YIG/Ti/Co structure with a nanowire period of 180 nm (device A2). Yellow circles, blue triangles, and green diamonds show the PSWSW group velocities extracted from the experimental data with mode number n = 2, n = 4, and n = 6, respectively. The solid lines are the group velocities calculated based on the derivative of the spin-wave dispersion relation in the YIG film
