Magnetic and Microwave Properties of Sm-Doped SrFe$_{12}$ O$_{19}$ Single Crystals

Samarium (Sm) doped M-type strontium ferrite single crystals have been successfully grown from melts using a flux system of SrCO
₃
and Na
₂
CO
₃
. The crystals exhibited the typical hexagonal ferrite growth habit with a plate-like geometry, and the largest crystals obtained are of 10 mm in length and 3-4 mm in thickness, respectively. It was observed that the saturation magnetization and anisotropy field are greatly affected by the doping concentration of Sm. A saturation magnetization (sigma
_s
) of 69.8 emu/g and an anisotropy field (
H

_k
) of 25 kOe was achieved. Room temperature FMR measurements show 85 Oe of linewidth (DeltaH) at 53 GHz.