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MA: Magnetismus

MA 16: Magn. Kopplungsph
änomene

MA 16.8: Talk

Wednesday, March 10, 2004, 17:00–17:15, H22

Spin polarized neutron reflectivity measurements on Heusler [Co₂MnGe/V]_n multilayers — •Andre Bergmann, Johannes Grabis, Vincent Leiner, Hartmut Zabel, and Kurt Westerholt — Institut für Experimentalphysik IV Ruhr Universität Bochum,

The Heusler alloy Co₂MnGe has been predicted to be a half metallic ferromagnet by electronic band structure calculations, making this alloy highly attractive for applications in spin electronic devices. We report spin polarized neutron reflectivity measurements of the magnetic order in [Co₂MnGe/V]_n multilayers prepared by rf-sputtering. In the neutron reflectivity scans we detect a half order magnetic Bragg peak which can be suppressed by applying a weak external magnetic field. The half order peak provides clear evidence for a doubling of the multilayer period due to antiferromagnetic (af) superlattice ordering in [Co₂MnGe/V]_n. The af ground state exists in the thickness range 1.5 nm ≤ d_V≤ 3nm without an indication of an oscillatory character of the interlayer exchange interaction.