Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnetic Materials II
MA 8.7: Vortrag
Montag, 26. März 2007, 16:45–17:00, H22
A spatially resolved investigation of the local, micro-magnetic domain structure of single and polycrystalline Co2FeSi. — •Andrei Gloskovskii1, Joachim Barth1, Benjamin Balke1, Gerhard Fecher1, Claudia Felser1, Florian Kronast2, Ruslan Ovsyannikov2, and Gerd Schönhense3 — 1Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg - Universität Mainz, D-55099 Mainz, Germany — 2BESSY GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 3Institut für Physik, Johannes Gutenberg - Universität Mainz, D-55099 Mainz, Germany
The Heusler compound Co2FeSi is a promising material for magneto-electronic devices. With a Curie temperature of 1100 K and a saturation magnetisation of 6 Bohr magnetons and a high spin polarisation at the Fermi edge it fulfils the essential requirements for magnetic sensors or spin valve structures. An essential feature for such devices is the micro-magnetic domain structure. XMCD-PEEM has been used for a direct observation of the domain structure of single- and polycrystalline samples. The (110)-oriented surface of the single crystal exhibits a multi-domain pattern characteristic for systems with an easy axis that might point out of the surface. Spin polarised photo emission from a single domain of the single crystal shows a spin polarisation of 16% at the Fermi energy and up to 35% in the d-bands, at room temperature.