Magnetic moment of the 4f8 and 4f75d electronic configurations of Tb3+ ions in wide bandgap fluoride dielectric crystals

The concentration of the Tb³⁺ ions in wide bandgap KY₃F₁₀ crystals was measured by the vibrating sample magnetometry method with 0.1% accuracy. The host crystal exhibits a diamagnetic response, while the Tb³⁺ ions have paramagnetic response to external magnetic fields in the 4f⁸ electronic configuration. In addition, vacuum ultraviolet coherent excitation of the 4f⁷5d electronic configuration enhances the magnetic moment of the 4f⁷5d electronic configuration in comparison to the magnetic moment of the 4f⁸ electronic configuration within the lifetime of the 4f⁷5d levels.