Regensburg 2002 – wissenschaftliches Programm
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MA: Magnetismus
MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111
MA 10.11: Poster
Dienstag, 12. März 2002, 15:00–19:00, Bereich A
Spin-resolved off-specular neutron scattering from magnetic domains using polarized 3He gas spin filter — •Florin Radu1, Alexei Vorobiev2,3, Janos Major3, Hubert Humblot2, Kurt Westerholt1, and Hartmut Zabel1 — 1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 2Institute Laue-Langevin, 38042 Grenoble cedex 9, France — 3Max-Planck-Institut für Metallforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany
We report on the use of the polarized 3He gas filter and neutron resonant enhancement techniques for the measurement of spin-polarised diffuse neutron scattering from magnetic domains. A CoO/Co exchange biased bilayer was grown on a Ti/Cu/Al2O3 neutron resonator template. The system was cooled in an applied magnetic field of Ha=2000 Oe through the Neel temperature of the ferromagnet to 10 K where the applied magnetic field is swept as to measure the magnetic hysteresis loop. A stable magnetic domain state of the ferromagnet is reached at about the coercive field of the second magnetisation reversal (Hc2=370 Oe). Here we have measured the 4 off-specular maps I++, I+-, I-+, I–. They show a striking behavior in the total reflection region: while the non-spin-flip scattering shows no diffuse reflectivity, the spin-flip scattering shows strong diffuse scattering at incident angles, which satisfy the resonance conditions. Moreover the spin-flip off-specular part of the reflectivity is asymmetric. The I-+ intensity scatters at higher exit angles than the specularly reflected neutrons and the I+- is scattered at lower angles. Their intensities are different as well. This work is supported bySFB491