Mn5Ge3 films grown on Ge(1 1 1)-c(2×8)

Abstract An investigation of the structural, magnetic and electronic properties of ≈ 3 nm thick Mn 5 Ge 3 films epitaxially grown on a Ge(1 1 1)- c (2 × 8) reconstructed surface is reported. High resolution transmission electron microscopy and selected area electron diffraction give evidence of 2.2% in-plane compressive strain between the Mn 5 Ge 3 film and the Ge substrate. Magnetooptical Kerr effect measurements show that the films are ferromagnetic with a Curie temperature of ≈ 325 K. The analysis of Ge 3 d core level photoelectron spectra of the Mn 5 Ge 3 films allows determining an upper limit of 76 meV for the Ge 3 d 5/2 core-hole lifetime broadening. The Ge 3 d 3/2 core-hole lifetime broadening is found to be 15 meV larger than that of the Ge 3 d 5/2 core hole, because of the existence of a Coster–Kronig decay channel due to the metallic character of Mn 5 Ge 3 .