Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 475, Issue -, Pages 176-183Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2018.11.086
Keywords
Neutron imaging; Crystal growth; Pressure techniques; Magnetic domains; Magnetic phase transitions; Quantum phase transitions
Funding
- U.S. Department of Commerce, National Institute of Standards and Technology [60NANB15D361]
- DFG via the Transregional Collaborative Research Center [TRR 80]
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We performed neutron imaging of ferromagnetic transitions in Ni3Al and HgCr2Se4 crystals. These neutron depolarization measurements revealed bulk magnetic inhomogeneities in the ferromagnetic transition temperature with spatial resolution of about 100 mu m. To obtain such spatial resolution, we employed a novel neutron microscope equipped with Wolter mirrors as a neutron image-forming lens and a focusing neutron guide as a neutron condenser lens. The images of Ni3Al show that the sample does not homogeneously go through the ferromagnetic transition; the improved resolution allowed us to identify a distribution of small grains with slightly off-stoichiometric composition. Additionally, neutron depolarization imaging experiments on the chrome spinel, HgCr2Se4, under pressures up to 15 kbar highlight the advantages of the new technique especially for small samples or sample environments with restricted sample space. The improved spatial resolution enables one to observe domain formation in the sample while decreasing the acquisition time despite having a bulky pressure cell in the beam.
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