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VOLUME 50 (1989) | ISSUE 6 | PAGE 284
s-d-exchange resistive mechanism for spin-wave amplification in ferromagnetic semiconductors in rf electric field
If a ferromagnetic semiconductor is in a sufficiently strong, uniform rf electric field, which acts on the electrons in a resistive regime, a spin wave propagating through the semiconductor may be amplified in a nonresonant fashion (over a wide frequency range) by field energy transferred to the wave by the mechanism of s-d exchange.