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 14.18: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Off-specular Neutron Scattering from Magnetic Domain Walls — •Florin Radu1, Alexei Vorobiev2, David Jullien2, Hubert Humblot2, Janos Major3, Francis Tasset2, Kurt Westerholt1, and Hartmut Zabel1 — 1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 2Institut Laue-Langevin, 38042 Grenoble Cedex 9, France — 3Max-Planck-Institut fur Metallforschung, Heisenbergstr. 3, D-70569 Stuttgart, Germany
We report on the use of the 3He spin filter technique together with a quasi bound state neutron resonator for the measurement of spin-polarized diffuse neutron scattering from magnetic domain walls. The neutron polarization of the 3He spin-filter reached an outstanding value of 94% with a neutron transmission of about 40%. Therefore the spin-flip ratio becomes comparable to the one provided by the supermirrors. We used the device to measure the all four off-specular reflectivity maps I++, I+−, I−+ and I– from a ferromagnetic domain state of a neutron resonator. They show a striking behavior. While the non-spin-flip maps (I++, and I–) show weak diffuse scattering, the spin-flip maps (I−+ and I+−) exhibit strong off-specular signals. Moreover, the position of the off-specular signal follows closely a refraction law. The data suggests that the main cause of the off-specular scattering from No-dqmagnetic domainsNo-dq is actually refraction at their domain walls.