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High‐frequency Sound As A Probe Of Exchange Energy In Nickel

G. C. Alexandrakis, R. Devine, J. Abeles
Published 1982 · Physics

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The experiments performed at 9.37 GHz involve excitation of sound at ferromagnetic resonance via magnetoelastic coupling, its propagation through thick Ni samples, and reconversion to microwaves. In the ω‐k plane there is a substantial angle between the ω axis and the phonon dispersion relation. The intersection of the phonon and spin wave dispersion occurs at a wave vector for which a large part of the spin wave energy is due to exchange. It is for this reason that sound is particularly appropriate for measurement of exchange energy.The experiments performed at 9.37 GHz involve excitation of sound at ferromagnetic resonance via magnetoelastic coupling, its propagation through thick Ni samples, and reconversion to microwaves. In the ω‐k plane there is a substantial angle between the ω axis and the phonon dispersion relation. The intersection of the phonon and spin wave dispersion occurs at a wave vector for which a large part of the spin wave energy is due to exchange. It is for this reason that sound is particularly appropriate for measurement of exchange energy.
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