Magnetocrystalline Anisotropy of Europium Selenide

Abstract

The first- and second-order magnetocrystalline anisotropy constants of EuSe have been measured by a ferromagnetic-resonance technique at microwave frequencies and 1.3\ifmmode^\circ\else\textdegree\fi{}K on single-crystal spheres of about 100 \ensuremath{\mu} diam. The angular dependence of the resonant field for rotation in a {110} crystallographic plane yields both $\frac{{K}_{1}}{M}$ and $\frac{{K}_{2}}{M}$. The ferromagnetic-resonance linewidth was 60 Oe. The quantities $\frac{{K}_{1}}{M}$ and $\frac{{K}_{2}}{M}$ were measured to be -50\ifmmode\pm\else\textpm\fi{}6 and -83\ifmmode\pm\else\textpm\fi{}16 Oe, respectively. The cubic crystal-field splitting parameters ${b}_{4}$ and ${b}_{6}$ have been determined on the basis of Wolf's single-ion mechanism to be 4.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ and -1.3\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}4}$ ${\mathrm{cm}}^{\ensuremath{-}1}$/ion, respectively. The results are compared with those of EuO and EuS and with cubic host lattices that have been doped with ${\mathrm{Eu}}^{++}$ ions.