The neutron reflectometer N-REX+ is designed for the determination of structural and magnetic properties of surfaces, interfaces and thin film systems. It is operated by the Max Planck Society. First regular user experiments have been conducted in 2007.

The instrument is an angle-dispersive fixed-wavelength machine; the default wavelength is 4.3 Å. The default sample surface orientation is horizontal,
but experiments with vertical sample orientation can also be performed with certain restrictions.

Depending on sample requirements, the direct beam can be reflected upward or downward. Both unpolarized and polarized experiments can be conducted.
In polarized mode, full 4-channel polarisation analysis is provided, along with wide-angle spin analysis (e.g. by means of polarized 3He cells).

Magnetic fields up to 3 Tesla and cryogenic temperatures below 1 K can be provided. Large and heavy sample environments up to 440 mm diameter and 400 kg weight can be accomodated. In addition to specular and off-specular reflectivity measurements, large angle grazing incidence experiments are also possible. Optionally, neutron experiments can be combined in-situ with X-ray reflectivity experiments. Furthermore, spin-echo resolved grazing incidence scattering (SERGIS) experiments are possible.