FERRIMAGNETIC RESONANCE LINEWIDTH IN SINGLE-CRYSTAL MN-DOPED BA2ZN2FE12O22

The ferrimagnetic resonance linewidths in single crystals of Mn-doped Ba2Zn2Fe12O22 were measured as a function of frequency (0.01-40 GHz) and temperature (4-300 K). In addition, the saturation magnetization, g factor, and planar anistropy fields were measured. The field linewidth ΔH appears to scale with frequency; however, the field linewidth as a function of temperature for the hexaferrite exhibits maxima. The temperature-dependent resonant field values were used to calculate the anisotropy field as a function of temperature. These measurements were performed in a frequency-swept slot-coplanar device at a fixed value of applied magnetic field and in a traditional ferrimagnetic resonance system.