Magnetism Reflectometer

MAGREF |  BL-4A | SNS

Magnetism Reflectometer

Mission Statement

Magnetism at the nanoscale

To provide the user community with the capabilities to characterize non-uniform distributions of magnetization in nano-scale and meso-scale materials related to quantum condensed matter in a myriad of environmental conditions. 

Instrument Description

The Magnetism Reflectometer exclusively provides polarized neutron beams for the instrument’s general user program, enabling measurements of specular, off specular reflection and grazing incidence small angle scattering (GISANS) from vertical solid or solid/liquid interfaces.  Polarized neutron beams are produced with reflection or transmission polarizers.  Polarization analysis of the scattered beams with a mirror analyzer or 3He filter is optionally available. These capabilities enable characterization of non-uniform distributions of magnetism in nano-scale and meso-scale materials. 

Applications

Research using the Magnetism Reflectometer is primarily focused on studies of materials with a net magnetization—magnetization that can be perturbed by many environmental variables, including magnetic and electric fields, temperature, pressure, stress, and light.

Polarized neutron beams also enable some studies of non-magnetic materials including soft matter; for example, by quantifying incoherent scattering, or phase-inversion using the magnetic reference layer technique [C.F. Majkrzak and N.F. Berk, Phys. Rev. B 52, 10827 (1995)].

Specifications

Source- to-sample distance 18.703 m
Sample- to-detector distance 2.2972 m 
Detector size 21 x 18 cm2
Detector resolution 1.4 mm
Moderator Coupled supercritical hydrogen
Bandwidth 60 Hz (Δλ=3 A), 30 Hz (Δλ=6A)
Wavelength range 1.8 Å < λ < 14.0 Å
Q range 0 Å-1 < Q < 3.5 Å-1
Magnetic field max 1.2 T with a gap of 50 mm and 3 T with a gap of 10 mm
Polarization Reflection Polarizer P = 99%-96% λ (2A - 10.5A), Transmission Polarizer P = 96%-90% λ (4.5A - 12A)
T range 5 - 750 K
Minimum reflectivity 10-8