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- W2810244 abstract "Neutron spectrometric measurements of the acoustical and optical spin waves in magnetite are reported. The complete acoustical branch, and part of an optical branch, were determined for the [100] direction of the reduced zone, principally using the constant Q and constant energy transfer methods. The optical frequency, at which the A and B sublattices precess as units, is 0.058 ev. The results indicate a value for JAB of 2.3 x 10-3 ev, with a much smaller (and perhaps ferromagnetic) B-B interaction. The results so far are not very sensitive to the A-A interaction. The acoustic branch decreases in energy with temperature approximately as the magnetization. Difficulties in the experiments largely arise from irreconcilable requirements: that the energy transfers be large because the quantum energies are large, and that the momentum transfers be small in order that the magnetic form factor be of acceptable size. These and other aspects of the experiments are discussed. (auth)" @default.
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- W2810244 date "1962-09-15" @default.
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- W2810244 title "Spin waves in magnetite from neutron scattering" @default.
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