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

摘要

${rm Zn}_{1-x}{rm Mn}_{x}{rm O}$ films $(0leq{x}leq 0.070)$ were grown by plasma-assisted molecular beam epitaxy on Si substrates with AlN buffer layers. For low Mn concentration samples, ${x}leq 0.02$ , 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.