Using Brillouin light scattering spectroscopy, we determine the spin-wave exchange stiffness D and the exchange constant A for thin films of the full Heusler compound Co 2 FeSi prepared by pulsed laser deposition. The thermal spin-wave spectra were measured in various magnetic fields, for different transferred spin-wave momenta, and for different film thicknesses. Fitting the observed spin-wave frequencies, we find an extraordinarily large value of D = 7.15 ± 0.20 meV nm 2 ( A = 31.5 ± 1.0 pJ m −1 ) which is, to the best of our knowledge, only surpassed by the intermetallic compound Fe 53 Co 47 (Liu et al 1994 J. Appl. Phys. 75 7021).
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Gaier et al. (2009) studied this question.
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