Optical and Magnetic Properties of ${\rm Zn}_{1-x}{\rm Mn}_{x}{\rm O}$ Grown by Plasma-Assisted Molecular Beam Epitaxy

Zn
_1-x
Mn
_x
O films (0 ≤ ×≤ 0.070) were grown by plasma-assisted molecular beam epitaxy on Si substrates with AlN buffer layers. For low Mn concentration samples, x ≤ 0.02, photoluminescence spectra show strong near band edge emission. Strong phonon and exciton coupling-induced resonant Raman scattering was observed. Paramagnetic, antiferromagnetic, and ferromagnetic phases were observed. Room temperature ferromagnetism for all samples was attributed to the bound magnetic polaron effect.