Interaction of Spin Waves with Drifted Carriers in Solids

Interaction of θ=0° spin waves with drifted helicons is analyzed, and a convective instability is predicted. The mechanism for amplification is due to the second‐order rf electron field in the drift direction. This Lorentz field, $E_z{\mathrm{=ṽ}}_{\mathrm{trans}}{\mathrm{\times B̃}}_{\mathrm{trans}}{\mathrm{=ṽ}}_{\mathrm{trans}}{\mathrm{\times \mu }}_{\mathrm{eff}}{\mathrm{H̃}}_{\mathrm{trans}}$ is large because μ_eff is large in the region of synchronism between the spin wave and the electrokinetic wave.