Ferromagnetic Resonance in Nickel Ferrite as a Function of Temperature

Ferromagnetic resonance in NiO${\mathrm{Fe}}_2$ ${\mathrm{O}}_3$ has been studied over a temperature range of - 195°C to 588°C. From this study the variation in line width with temperature, $g$ value, and magnetic anisotropy constants $K_1$ and $K_2$ have been determined. Results show that the line width decreases with increasing temperature, the $g$ value remains essentially constant, and the two anisotropy constants show different sign behavior over the temperature range.