Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetic Half-metals and Oxides I

MA 15.5: Talk

Wednesday, March 24, 2010, 11:15–11:30, H22

Analysis of L2₁-ordering and study of properties on Co-based Heusler thin film samples — •Enrique Vilanova Vidal¹, Tanja Graf², Claudia Felser², and Gerhard Jakob¹ — ¹Institut für Physik, Johannes Gutenberg-Universität Mainz — ²Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität Mainz

Heusler alloys have been intensively investigated because they are promising materials for use in spin-dependent devices. Their half-metallic properties are strongly related with the presence of L2₁, B2 and fully disordered A2 structure. However, a rigorous method to study the proportions of these different ordering states is still missing. Sputtered thin epitaxial Co₂FeSi_0.6Al_0.4, Co₂FeGa_0.5Ge_0.5 and Co₂MnAl films have been prepared. These films were grown on MgO (100) with and without MgO buffer layer under UHV conditions and at different substrates temperatures. The deposition procedure is discussed, and the degree of L2₁ order as well as transport and magnetic properties are analyzed.