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Regensburg 2004 – scientific programme

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.114: Poster

Tuesday, March 9, 2004, 15:00–19:00, Bereich A

Characterization of doped Heusler alloys: Co2Cr1−xFexAl — •S. Wurmehl1, G. H. Fecher1, H. C. Kandpal1, K. Kroth1, H.-J. Elmers1, G. Schönhense1, C. Felser1, J. Morais2, Y. Hwu3, and R. Klauser41Johannes Gutenberg - Universität, D-55099 Mainz, Germany — 2Universidade Federal do Rio Grande do Sul, 91501-970 Porto Alegre, Brazil — 3Academia Sinica, Taipei, 11529, Taiwan — 4National Synchrotron Radiation Research Center, Hsinchu, 30077, Taiwan

Doped Heusler alloys and compounds of the Co2Cr1−xFexAl with varying Cr to Fe ratio x were produced and experimentally investigated. Most of the samples showed pronounced disorder instead of the expected L21 structure. The sample surfaces exhibited a strong selective oxidation of chromium. The bulk samples were characterized by standard methods such as X-ray diffraction, SQUID magnetometry, and depth profiling. X-ray absorption was used together with XMCD to examine different oxidation stages in bulk and powder samples and to determine element specific magnetic moments. Surface sensitive methods, like low energy ion scattering, photoemission, PEEM, and scanning XPS microscopy, were used to examine the oxidation process. The nature of the selective oxidation of chromium in these compounds will be discussed on hand of the experimental findings.

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