Electromagnetic Approach to Cavity Spintronics

The fields of cavity quantum electrodynamics and magnetism have recently merged into spintronics, investigating a quasiparticle that emerges from the strong coupling between standing electromagnetic waves confined in microwave resonator quanta spin waves, magnons. This phenomenon is now expected to be employed variety devices for applications ranging communication dark matter detection. To successful, most these require vast control strength, resulting intensive efforts understanding by different approaches. Here, properties both magnetic samples are investigated provide comprehensive two systems. Because consequence excitation vector fields, which directly interact with magnetization dynamics, highly accurate perturbation theory predicts resonant hybrid mode frequencies any field configuration within resonator. shown strongly dependent not only on sample's but also shape. These findings illustrated applying theoretical framework distinct experiments: sphere placed three-dimensional rectangular, prism two-dimensional provides overall behavior coupled systems it can easily modified other