Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)

MA 14.97: Poster

Dienstag, 25. März 2003, 15:15–19:15, Zelt

Heusler alloys and double perovskites as half-metallic materials — •Gerhard Jakob¹, Nicole Auth¹, Thomas Block², and Claudia Felser² — ¹Institut für Physik, Universität Mainz, Staudinger Weg 7, 55099 Mainz — ²Institut für Anorganische und Analytische Chemie, Universität Mainz, Düsbergweg 10-14, 55099 Mainz

We investigate Heusler alloys (Co₂Cr_1−xFe_xAl) and double perovskites (Sr₂FeMoO₆) with respect to their applicability in magnetoresistive sensors. Both materials are half-metals according to band structure calculations, i.e. they show only one spin direction for the charge carriers at the Fermi edge, and show strong magnetoresistive effects. The suppression of Andreev reflections in superconducting point contact spectroscopy has been proposed as a method to determine the degree of spin polarisation. We applied this method to our materials and discuss the validity of the extracted spin polarisation values in disordered metals.