Anisotropy of magnetic polarons bound to acceptors inCd1−xMnxSe

Time-resolved donor-acceptor luminescence provides the main parameters of magnetic polarons bound to acceptors in ${\mathrm{Cd}}_{1\mathrm{-}\mathrm{x}}$ ${\mathrm{Mn}}_{\mathrm{x}}$Se. Time resolved polarization of this emission with H∥c in the Faraday geometry reveals the freezing of the polaron orientation at low temperature. This is related to the gyromagnetic factor $g_{\perp }$=0 for the hole in wurtzite crystals, leading to a bistable magnetic polaron.