DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 2010 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

MA: Fachverband Magnetismus

MA 6: Magnetic Thin Films I (Heusler Alloys)

MA 6.7: Talk

Monday, March 22, 2010, 16:00–16:15, H10

Thin magnetic films of the Heusler compound Co2FeAl0.4Si0.6 — •Frederick Casper1, Tanja Graf1, Johannes Paul2, Gerhard Jakob3, and Claudia Felser11Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg - University, 55099 Mainz, Germany — 2SENSITEC GmbH, 55131 Mainz, Germany — 3Institute of Physics, Johannes Gutenberg - University, 55099 Mainz, Germany

Half-metallic compounds which are fully spin polarized near the Fermi level (EF) due to an energy gap in the minority-spin channel have attracted great attention as key materials for creating spintronic devices. Co-based Heusler compounds have been predicted to have a high spin polarization even at room temperature due to their high Curie temperature of around 1000 K. To overcome the problem of narrow energy separation between the Fermi level and the bottom edge of the conduction band, Co2FeAl1−XSiX (CFAS) has been predicted to be more stable against the influence of temperature. For X = 0.5, several reports show promising results with CFAS in magnetic tunnel junctions using MgO and Al2O3 as tunnel barrier. Here we show the first results of Co2FeAl0.4Si0.6 films on MgO and SiOX substrates. Depending on the annealing temperature, buffer layer and substrate, CFAS shows B2 and/ or L21 type of order. Magnetic moments ranging from 3.8 to 5.1 µB/f.u. depending on the degree of ordering. AFM measurements show smooth surfaces, and XPS reveal the right stoichiometry for all films. This work is supported by the Federal Ministry for Education and Research BMBF, project "‘Multimag"’.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2010 > Regensburg