We report on the first observation of spin noise in a strongly birefringent semiconductor—halide perovskite single crystal ${\mathrm{MAPbI}}_3$. The observed spin noise resonance is attributed to resident free holes in the bulk of the crystal with one of the longest spin dephasing times $T_2=4\mathrm{ns}$. The spin dynamics is found to be affected by the residual light absorption of the crystal providing renormalization of the Larmor frequency. Extended spin noise spectroscopy with a rotating magnetic field allowed us not only to evaluate the $g$-factor anisotropy but also to distinguish two different spin subsystems tentatively associated with twinning of the crystal. This work opens the way to studies of spin physics of bulk anisotropic semiconductors in general and perovskites in particular.

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• Spin dynamics
• Semiconductor compounds
• Single crystal materials
• Electron-correlation calculations
• Spin noise spectroscopy