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Metal halide perovskites make up a promising class of materials forsemiconductor spintronics. Here we report a systematic investigation ofcoherent spin precession, spin dephasing and spin relaxation of electrons andholes in two hybrid organic-inorganic perovskites MA0.3FA0.7PbI3 andMA0.3FA0.7Pb0.5Sn0.5I3 using time-resolved Faraday rotation spectroscopy. Withapplied in-plane magnetic fields, we observe robust Larmor spin precession ofelectrons and holes that persists for hundreds of picoseconds. The spindephasing and relaxation processes are likely to be sensitive to the defectlevels. Temperature-dependent measurements give further insights into the spinrelaxation channels. The extracted electron Land\'e g-factors (3.75 and 4.36)are the biggest among the reported values in inorganic or hybrid perovskites.Both the electron and hole g-factors shift dramatically with temperature, whichwe propose to originate from thermal lattice vibration effects on the bandstructure. These results lay the foundation for further design and use of lead-and tin-based perovskites for spintronic applications.

Spin Coherence and Spin Relaxation in Hybrid Organic-Inorganic Lead and Mixed Lead-Tin Perovskites