Wave Propagation in a Gyromagnetic Solid Conductor: Helicon Waves

The propagation of circularly polarized electromagnetic waves in a solid under a high dc magnetic field is examined theoretically. An experiment is performed, in which there is transmission through a thin slab of InSb of a 10 000-Mc/sec wave, at liquid nitrogen and room temperatures. Results are in good agreement with the "helicon" theory, which implies that $\omega \ll {\omega }_c$, ${\omega }_c\tau \gg 1$.