Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.92: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Spin-resolved PEEM study of a single crystal Heusler alloy — •Ruslan Ovsyannikov1, Florian Kronast1, Andrei Gloskovskii2, Gerhard H. Fecher2, Claudia Felser2, Hermann A. Dürr1, and Wolfgang Eberhardt1 — 1BESSY GmbH, Albert-Einstein-Straße 15, 12489 Berlin, Germany — 2Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg - Universität Mainz, D-55099 Mainz, Germany
Heusler compounds are of the general formula X2YZ. X and Y are usually transition metals and Z is either a non-magnetic metal or a non-metal. The crystal structure of a Heusler is marked by four interpreting fcc-lattices. Certain Heusler like Co2FeSi have been theoretically predicted to be half-metallic ferromagnets. The high spin polarization at the Fermi level in combination with a high Curie temperature makes those materials promising candidates for applications in spintronics. Because of the difficult surface preparation and a complex domain pattern in remanence a direct experimental prove of half-metallicity e.g. by spin-resolved photoemission is still missing. A new spin-resolved photoemission electron microscope (S-PEEM) at BESSY helps to overcome at least one of this problem since it combines spatial resolution with spin analysis. The S-PEEM at the UE49 microfocus beamline is based on a commercial Elmitec PEEM with integrated energy analyzer, additionally equipped with two Mott polarimeter for spin analysis. Thus it allows to record spin resolved photoemission spectra from selected area e.g. a single magnetic domain. In this poster we present spin-resolved photoemission measurements from selected magnetic domains of a Co2FeSi single crystal.