Jamal Ben Youssef

Magnetic materials can store oscillatory energy, like a tuning fork that keeps ringing after being struck. When such a material is placed in a microwave cavity, its oscillations (magnons) start interacting with light (photons).

A room of funhouse mirrors: you stand in the center, and the echo of your voice comes back from an unexpected direction, amplified and distorted. That is how spin waves in a thin magnetic film, excited by an antenna, reflect off defects and irregularities, creating a tangled pattern of fields.