Title :
Frequency dependence of the FMR linewidth in single crystal barium ferrite platelets
Author :
Karim, R. ; McKinstry, K.D. ; Truedson, J.R. ; Patton, C.E.
Author_Institution :
Dept. of Phys., Colorado State Univ., Fort Collins, CO, USA
fDate :
9/1/1992 12:00:00 AM
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±.02 Oe/GHz, and has a zero frequency extrapolation close to zero. These data yield a Landau-Lifshitz damping frequency of 4.6×106 rad/s
Keywords :
barium compounds; ferrites; ferromagnetic resonance; 55 to 90 GHz; BaFe12O19 single crystal; EHF; FMR linewidth; Landau-Lifshitz damping frequency; ferromagnetic resonance linewidth; frequency dependence; frequency range; millimeter-wave frequencies; shorted waveguide measurement technique; uniform mode precession; Barium; Crystals; Extrapolation; Frequency dependence; Frequency measurement; Magnetic resonance; Measurement techniques; Millimeter wave measurements; Millimeter wave technology; Performance evaluation;
Journal_Title :
Magnetics, IEEE Transactions on
