A method is presented for performing Brillouin-light-scattering measurements on uniform-precession and low-wave-number (low-k) magnons excited by a microwave magnetic field in opaque magnetic specimens. The optical configuration is similar to that employed in conventional 180° backscattering measurements, except that the incident and specularly reflected beams pass through the collection lens along different parallel paths. Examples of spectra from a Ni81Fe19 film are presented that include separate detection of light scattered from low-k magnons with the same frequency as the uniform precession.
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Johnson et al. (2005) studied this question.
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