Growth and characterization on M-type hexaferrite single crystals

A comparative study has been carried out of the magnetic and dielectric losses between 90 and 100 GHz for strontium hexaferrite single crystals freely nucleated in differents fluxes and pulled from a sodium ferrite flux. The crystal growth conditions are described and the results of X-ray and impurity analyses of the crystals presented. To accurately compare the magnetic losses, the influence of the surface structure of the measurement sphere on the measured linewidths has been evaluated. No significant difference was found between the losses of crystals obtained from sodium ferrite and sodium oxide fluxes. Slightly higher losses for a boron oxide flux could be due to the presence of divalent iron or a second phase.