Magnetocrystalline Anisotropy of Europium Selenide

The first- and second-order magnetocrystalline anisotropy constants of EuSe have been measured by a ferromagnetic-resonance technique at microwave frequencies and 1.3^∘{}K on single-crystal spheres of about 100 {μ} diam. The angular dependence of the resonant field for rotation in a {110} crystallographic plane yields both K₁M and K₂M. The ferromagnetic-resonance linewidth was 60 Oe. The quantities K₁M and K₂M were measured to be -50±{}6 and -83±{}16 Oe, respectively. The cubic crystal-field splitting parameters b₄ and b₆ have been determined on the basis of Wolf's single-ion mechanism to be 4.5×{}10^-4 and -1.3×{}10^-4 cm^-1/ion, respectively. The results are compared with those of EuO and EuS and with cubic host lattices that have been doped with Eu⁺⁺ ions.