Abstract
IT has been shown by Elliott and Lowde1 that spin waves will manifest themselves in the neutron scattering by a crystal as coherent diffuse peaks near the elastic reflexions. In particular, the dispersion relation of the spin waves may be directly obtained from the way the diffuse peak-width Γ changes with Θ–ΘB, the angular missetting of the crystal from the Bragg setting. Such measurements have been done on crystals of iron2 and magnetite3, and in both cases a quadratic dispersion law was found.
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References
Elliott, R. J., and Lowde, R. D., Proc. Roy. Soc., A, 230, 46 (1955).
Lowde, R. D., Proc. Roy. Soc., A, 221, 206 (1954).
Riste, T., Blinowski, K., and Janik, J., J. Phys. Chem. Solids, 9, 153 (1959).
Gilleo, M. A., Phys. Rev., 109, 777 (1958).
Shull, C. G., Strauser, W. A., and Wollan, E. O., Phys. Rev., 83, 333 (1951).
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GOEDKOOP, J., RISTE, T. Neutron Diffraction Study of Antiferromagnetic Spin Waves in α-Ferric Oxide. Nature 185, 450–452 (1960). https://doi.org/10.1038/185450a0
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DOI: https://doi.org/10.1038/185450a0
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