Two‐dimensional metastable magnetic semiconductor structures

Metastable zinc‐blende MnSe has been grown by molecular beam epitaxy. The magnetic semiconductor has been incorporated into three novel superlattice structures which include a binary ZnSe/MnSe superlattice, a comb superlattice, and a ZnSe/(Zn,Mn)Se superlattice structure consisting of ZnSe wells perturbed by the insertion of ultrathin layers (two to three monolayers) of MnSe. Reflection high‐energy electron diffraction and transmission electron microscopy reveal the zinc‐blende crystal structure of the MnSe layers. Preliminary optical measurements show agreement with anticipated exciton emission energies; such spectra show large magnetic field induced shifts indicating that, although MnSe is antiferromagnetic, these ‘‘two‐dimensional’’ magnetic sheets exhibit paramagnetic behavior.