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 13.19: Poster
Tuesday, March 9, 2004, 15:00–19:00, Bereich A
Magnetic and Magneto-Optical Properties of UH3 Thin Films — •D. Kolberg1, A. Navratil1, T. Gouder2, F. Wastin2, and J. Schoenes1 — 1Institut für Halbleiterphysik und Optik und Magnetfeldanlage, TU Braunschweig, Mendelssohnstr. 3, D-38106 Braunschweig, Germany — 2European Commission, Joint Research Centre, Institute for Transuranium Elements, Postfach 2340, D-76125 Karlsruhe, Germany
The first ever observed ferromagnet among actinide compounds was UH3 with its astonishingly high TC of 180 K [1]. Bulk uranium metal powderises during hydrogen loading, which makes it impossible to investigate optical and magneto-optical properties of UH3. This drawback can be circumvented when growing thin films of uranium with a cap layer of Pd. However, subsequent H loading leads to inhomogeneous films and possible destruction [2]. Our new approach is to grow uranium thin films and to hydrogenate them at the same time. The protection against oxydation, i.e., the Pd cap layer, is grown on top of the UH3 films. The cleanliness of the films will be checked via in-situ XPS. Secondly, we monitor the hydrogen uptake using SQUID magnetometry. Finally, we investigate the magneto-optical properties of UH3 films in magnetic fields up to 11.5 Tesla and in the range 0.2 eV < ℏ ω < 5 eV.
Financial support of the DFG (Scho 642/2-2) is acknowledged.
[1] R. Troć and W. Suski, J. Alloys Comp. 219 (1995) 1 [2] D. Kolberg et al., Verhandl. DPG (VI) 38 (2003) 324