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MA: Fachverband Magnetismus

MA 22: Magnetic Measurement Methods

MA 22.5: Talk

Tuesday, March 15, 2011, 12:00–12:15, HSZ 403

The new high-intensity polarized neutron reflectometer of the Jülich Centre of Neutron Science — •Stefan Mattauch¹, Denis Korolkov¹, Ulrich Rücker², Earl Babcock¹, Alexander Ioffe¹, and Thomas Brückel² — ¹JCNS,Institut für Streumethoden, Forschungszentrum Jülich GmbH — ²Institut für Streumethoden, Forschungszentrum Jülich GmbH

The Jülich Centre of Neutron Science (JCNS) is building the new, high-intensity reflectometer MARIA in the neutron guide hall of the FRM II reactor in Garching. Unique features of MARIA include (i) vertical focussing with an elliptic guide from 170 mm down to 10 mm at the sample position, (ii) reflectometer and GISANS mode, (iii) polarization analysis over a large 2d position sensitive detector as standard, (iv) adjustable wavelength spread from 10 to 1 % by a combination of velocity selector and chopper, (v) flexible sample table using a Hexapod for magnetic field and low temperature sample environment and (vi) in-situ sample preparation facilities. Together with a 400 x 400 mm² position sensitive detector and a time-stable ³He polarization analyzer based on Spin-Exchange Optical Pumping (SEOP), the instrument is dedicated to investigate specular reflectivity and off-specular scattering from magnetic layered structures down to the monolayer regime. In addition the GISANS option can be used to investigate lateral correlations in the nm range. This option is integrated into the reflectometer*s collimation, so it can be chosen during the measurement without any realignment.
The results of the first experiments will be presented at the conference.