Abstract
Measurements of the frequency dependence of the room-temperature ferromagnetic resonance (FMR) linewidth have been performed in well-characterized barium hexaferrite single crystals at millimeter-wave frequencies. A shorted waveguide measurement technique was used to obtain very clean FMR profiles in the frequency range of 55 to 90 GHz. FMR field values versus frequency determined from these profiles show good agreement with theoretical values for uniform mode precession. The FMR linewidth increases linearly with frequency at a rate of 0.54+or-.02 Oe/GHz, and has a zero frequency extrapolation close to zero. These data yield a Landau-Lifshitz damping frequency of 4.6*10/sup 6/ rad/s.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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