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Here we demonstrate that MnTe epitaxial films with zinc-blend structure andMnTe/ZnTe multilayers should show ferroelectric polarization inantiferromagnetically (AFM) ordered state and thus belong to multiferroics.Spontaneous ferroelectric polarization results from the bending of highly ionicMn-Te-Mn bonds induced by magnetostrictive shear strain. Orientation offerroelectric polarization is coupled with orientation of AFM vector and thuscan be controlled by application of the external magnetic field. Due to theclamping of electric and magnetic order parameters, domain structure in MnTe isgoverned by two mechanisms: depolarizing field produced by electric dipoles anddestressing field produced by magnetoelastic dipoles. The values ofmonodomainization electric and magnetic fields depend upon the sample shape anddiminish with the film thickness. Magnetoelectric nature of the domains make itpossible to visualize the domain structure by linear and nonlinear opticalmethods (Kerr effect, second harmonic generation technique).

Magnetostriction-driven multiferroicity of MnTe and MnTe/ZnTe epitaxial films