Nanometre-Scale Magnons Detected With Soft X-ray Microscopy

Researchers have, for the first time, directly imaged magnon populations across two-dimensional momentum space using a new technique called magnon momentum microscopy. This resonant magnetic soft-X-ray scattering method overcomes a key experimental challenge in the field: detecting magnons at nanometre wavelengths, where exchange interactions govern their dynamics. Applying the technique to yttrium iron garnet, the team revealed a rich variety of previously unobserved nonlinear magnon interactions. With its ability to capture these interactions over large regions of the dispersion plane, magnon momentum microscopy establishes a versatile platform for exploring short-wavelength and nonlinear magnonics, potentially advancing wave-based information processing beyond conventional electronics. The ability to directly visualize the behaviour…