Dresden 2006 – scientific programme
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MA: Magnetismus
MA 4: Magnetic Materials I
MA 4.3: Talk
Monday, March 27, 2006, 10:45–11:00, HSZ 401
Structural and physical properties of the quarternary Heusler alloys Co2Mn1−xFexSi: A search for the optimal material for spintronic devices — •Benjamin Balke, Hem Chandra Kandpal, Vadim Ksenofontov, Gerhard H. Fecher, and Claudia Felser — Johannes Gutenberg - Universität, 55099 Mainz, Germany
The strucural and magnetic properties of the quarternary Heusler alloys Co2Mn1−xFexSi (x=0, 0.1,…,1) were investigated by means of X-ray diffraction, SQUID magnetometry, ESCA, 57Fe Mößbauer spectroscopy, and differential scanning calometry messurments. The pure Co2MnSi compound is allready used as an electrode in magnetic tunnel juctions. Previous LSDA calculations predicted Co2MnSi to be a half-metallic ferromagnet with a spinpolarisation of 100%, a value that could not be verified by experiments up to now. Recent investigations of the electronic strucutre of Heusler compounds gave advice that on-site correlation plays a role in these componds and may serve to destroy the half-metallic properties of Co2MnSi. At the same time Co2FeSi becomes a half-metallic ferromagnet if on-site correlation is respected in electronic structure calculations.
This investigation focuses on the search of a mixed compond where the half-metallic behaviour is stable against the variation of on-site correlation. (This work is funded by the DFG in FG 559.)