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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, Ez=ṽtrans×B̃trans=ṽtrans×μeffH̃trans is large because μeff is large in the region of synchronism between the spin wave and the electrokinetic wave.
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B. Vural (1966) studied this question.
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