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The spin dynamics of the strongly localized, donor-bound electrons influorine-doped ZnSe epilayers is studied by pump-probe Kerr rotationtechniques. A method exploiting the spin inertia is developed and used tomeasure the longitudinal spin relaxation time, $T_1$, in a wide range ofmagnetic fields, temperatures, and pump densities. The $T_1$ time of thedonor-bound electron spin of about 1.6 $\mu$s remains nearly constant forexternal magnetic fields varied from zero up to 2.5 T (Faraday geometry) and ina temperature range $1.8-45$ K. The inhomogeneous spin dephasing time,$T_2^*=8-33$ ns, is measured using the resonant spin amplification and Hanleeffects under pulsed and steady-state pumping, respectively. These findingsimpose severe restrictions on possible spin relaxation mechanisms.

Longitudinal and transversal spin dynamics of donor-bound electrons in fluorine-doped ZnSe: spin inertia versus Hanle effect