Anisotropic wavevector-dependent damping of thickness-quantized magnons
This study used high-resolution spectroscopy to probe spin waves in YIG films to find that their damping is not uniform. Researchers discovered a regular sawtooth pattern in the magnetic field, which shows that damping depends on both the mode number and the direction of wave propagation (in-plane vs. out-of-plane). This reveals an anisotropic, wavevector-dependent loss mechanism that standard models fail to capture.