DEMAND, a dimensional extreme magnetic neutron diffractometer at the high flux isotope reactor

Huibo Cao, Bryan C. Chakoumakos, Katie M. Andrews, Yan Wu, Richard A. Riedel, Jason Hodges, Wenduo Zhou, Ray Gregory, Bianca Haberl, Jamie Molaison, Gary W. Lynn

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

A two-dimensional (2D) Anger camera detector has been used at the HB-3A four-circle single-crystal neutron diffractometer at the High Flux Isotope Reactor (HFIR) since 2013. The 2D detector has enabled the capabilities of measuring sub-mm crystals and spin density maps, enhanced the efficiency of data collection and phase transition detection, and improved the signal-to-noise ratio. Recently, the HB-3A four-circle diffractometer has been undergoing a detector upgrade towards a much larger area, magnetic-field-insensitive, Anger camera detector. The instrument will become capable of doing single-crystal neutron diffraction under ultra-low temperatures (50 mK), magnetic fields (up to 8 T), electric fields (up to 11 kV/mm), and hydrostatic high pressures (up to 45 GPa). Furthermore, half-polarized neutron diffraction is also available to measure weak ferromagnetism and local site magnetic susceptibilities. With the new high-resolution 2D detector, the four-circle diffractometer has become more powerful for studying magnetic materials under extreme sample environment conditions; hence, it has been given a new name: DEMAND.

Original languageEnglish
Article number5
JournalCrystals
Volume9
Issue number1
DOIs
StatePublished - Jan 2019

Funding

The research using polarized neutron diffraction and high pressure is supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Early Career Research Program Award KC0402010, under Contract DE-AC05-00OR22725. This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.We thank Cornelius Donahue, Christopher Montcalm, and Theodore Visscher for detector development, Van Graves, Jonathan Smith, and Mike Harrington for instrument upgrade support; Matthew Collins, Cory Fletcher, Tyler White, and Christopher M. Redmon for supporting the ultra-low temperature and cryomagnet experiments, Mark J. Loguillo and Gerald M. Rucker for supporting DAC high-pressure loading, Harish Agrawal, Doug Armitage, and John Wenzel for sample environment development, Gary A. Taufer and Larry R. Senesac for SPICE support, and Mike Hittman for machining support.

FundersFunder number
U.S. Department of EnergyDE-AC05-00OR22725, KC0402010

    Keywords

    • Anger camera
    • Atomic magnetic susceptibility
    • High pressure
    • Local magnetic susceptibility
    • Magnetic materials
    • Magnetism
    • Polarized neutron diffraction
    • Position sensitive detector
    • Single-crystal neutron diffraction
    • Ultra-low temperature

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