GINA-A polarized neutron reflectometer at the Budapest Neutron Centre

Journal Article · Tue Jan 15 00:00:00 EST 2013 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4770129· OSTI ID:22105371

Bottyan, L.; Merkel, D. G.; Nagy, B.; Sajti, Sz.; Deak, L.; Endroczi, G. ^[1]; Fuezi, J. ^[2]; Petrenko, A. V. ^[3]; Major, J. ^[1]

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1. Wigner RCP, RMKI, H-1525 Budapest, P.O. Box 49 (Hungary)
2. Wigner RCP, SZFKI, H-1525 Budapest, P.O. Box 49 (Hungary)
3. Frank Laboratory of Neutron Physics, JINR, Joliot-Curie 6, Dubna, 141980 (Russian Federation)

The setup, capabilities, and operation parameters of the neutron reflectometer GINA, the recently installed 'Grazing Incidence Neutron Apparatus' at the Budapest Neutron Centre, are introduced. GINA, a dance-floor-type, constant-energy, angle-dispersive reflectometer is equipped with a 2D position-sensitive detector to study specular and off-specular scattering. Wavelength options between 3.2 and 5.7 A are available for unpolarized and polarized neutrons. Spin polarization and analysis are achieved by magnetized transmission supermirrors and radio-frequency adiabatic spin flippers. As a result of vertical focusing by a five-element pyrolytic graphite monochromator, the reflected intensity from a 20 Multiplication-Sign 20 mm{sup 2} sample has been doubled. GINA is dedicated to studies of magnetic films and heterostructures, but unpolarized options for non-magnetic films, membranes, and other surfaces are also provided. Shortly after its startup, reflectivity values as low as 3 Multiplication-Sign 10{sup -5} have been measured by the instrument. The instrument capabilities are demonstrated by a non-polarized and a polarized reflectivity experiment on a Si wafer and on a magnetic film of [{sup 62}Ni/{sup nat}Ni]{sub 5} isotope-periodic layer composition. The facility is now open for the international user community. Its further development is underway establishing new sample environment options and spin analysis of off-specularly scattered radiation as well as further decreasing the background.

• OSTI ID: 22105371
• Journal Information: Review of Scientific Instruments, Vol. 84, Issue 1; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ELECTRONS
MEMBRANES
NEUTRONS
NICKEL 62
POSITION SENSITIVE DETECTORS
RADIOWAVE RADIATION
REFLECTIVITY
SPIN
SPIN ORIENTATION