MLZ is a cooperation between:
> Technische Universität München
> Helmholtz-Zentrum Hereon
> Forschungszentrum Jülich
MLZ is a member of:
> LENS
> ERF-AISBL
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MLZ (eng)
Lichtenbergstr.1
85748 Garching
NREX
Polarised neutron reflectometer with X-ray option
This instrument is focussed on cold neutrons. All parameters given here are valid during the current operation of FRM II. Please get in touch with the instrument team well in advance for all further details (length of experiment etc.).
The neutron/ X-ray contrast reflectometer NREX is designed for the determination of structural and magnetic properties of surfaces, interfaces, thin films and heterostructures.
A focusing multiblade monochromator allows for measuring small area (20 mm2) samples with high polarisation in a dynamic range of six orders of magnitude. For larger samples and a non-polarized beam more than seven orders are feasible. A horizontal alignment of the sample allows for performing (a) GISANS and GIND and (b) in-situ X-ray experiments. For the latter an optional X-ray reflectometer is mounted perpendicular to the neutron beam. Simultaneous neutron/ X-ray experiments allows for effective studies of irreversible processes and sensitive samples.
A (polarised) neutron reflectometry alone and in combination with X-ray reflectometry provides information about spatial distribution of chemical elements and isotopes and magnetic moment. A selected list of examples:
- Interface phenomena in strongly correlated heterostructures
- Model surfaces for biofunctional studies
- Physics and chemistry of liquid/solid and gas/solid interfaces
- New materials for spintronic, quantum and neuromorphic computing
- Influence of reduced dimensionality on magnetic properties
- Soft thin films
- Material science of thin films and heterostructures
- Closed cycle cryostat (down to 3.5 K) with low background sapphire windows
- 3He cryostat (down to 0.5 K), bottom loaded with large sample space
- Electromagnet (up to 3.5 T) with versatile field direction in x, y and z
- In-situ X-ray reflectometer
- Gas tight chamber with controllable atmosphere (H2, H2O, Ar, N2, etc.) and temperature (up to 600 K)
- Humidity control system. Humidity 0 – 100 % (H2O or D2O), temperature 20°C < T < 50°C.
- High voltage sample stick (up to 10 kV).
- In-situ transport measurement
- γ-detector for surface prompt-gamma analysis
- Type: 7 × 5 HOPG crystals, horizontal focussing
- Wavelengths: 2.9 – 5.5 Å
- Wavelength resolution: 1…2 %
- Distance to sample: 2500 mm
- Vertical
- Slit sizes: 0.2 – 6 mm
- Divergence: 0.05 – 1.4 mrad
- Horizontal
- Slit: 0.2 – 100 mm
- Polarisation: > 99.9 %
- Analyser: > 99.0 %
- Flipper efficiency: > 99.99 %
- 2 pencil detectors: 3He
- 2D area detector: 3He wire chamber
- Active area: 200 × 200 mm2
- Lateral resolution: 3 mm
- Distance to sample: 2465 mm
- Non-polarised: 3 · 105 n cm-2 s-1
- Polarised: 1 · 105 n cm-2 s-1
- Specular reflectivity: 1 : 1 ·10-6 (@ 5 × 5 mm² sample and full polarization)
- Limits of Q-components (for λ = 2.9 Å)
- Qz: 0.0075 – 0.75 Å-1
- Qx: 7.5 · 10-5– 7.5 ·10-3 Å-1
- Qy: 0.03 – 2.3 Å-1
- Source: Cu-Kα fixed anode (1.54 Å)
- Monochromator: Göbel Mirror & Double Ge-Crystal
- Detector: 1-dimensional DECTRIS
Instrument Scientists
Dr. Thomas Keller
Phone: +49 (0)89 289-12164
E-Mail: T.Keller@fkf.mpg.de
NREX
Phone: +49 (0)89 289-14878
Operated by
Publications
Find the latest publications regarding NREX in our publication database iMPULSE:
Citation of the instrument
Max-Planck-Institut für Festkörperforschung and Heinz Maier-Leibnitz Zentrum. (2015). NREX: Neutron reflectometer with X-ray option. Journal of large-scale research facilities, 1, A38. http://dx.doi.org/10.17815/jlsrf-1-30
For citation please always include the DOI.
Gallery
MLZ is a cooperation between:
> Technische Universität München> Helmholtz-Zentrum Hereon
> Forschungszentrum Jülich
MLZ is a member of:
> LENS> ERF-AISBL
MLZ on social media: