High-resolution neutron depolarization microscopy of the ferromagnetic transitions in Ni3Al and HgCr2Se4 under pressure
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JORBA, Pau, SCHULZ, Michael, HUSSEY, Daniel, ABIR, Muhammad I., SEIFERT, Marc, TSURCAN, Vladimir, LOIDL, Alois, PFLEIDERER, Christian, KHAYKOVICH, Boris. High-resolution neutron depolarization microscopy of the ferromagnetic transitions in Ni3Al and HgCr2Se4 under pressure. In: Journal of Magnetism and Magnetic Materials, 2019, vol. 475, pp. 176-183. ISSN 0304-8853. DOI: https://doi.org/10.1016/j.jmmm.2018.11.086
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Journal of Magnetism and Magnetic Materials
Volumul 475 / 2019 / ISSN 0304-8853

High-resolution neutron depolarization microscopy of the ferromagnetic transitions in Ni3Al and HgCr2Se4 under pressure

DOI: https://doi.org/10.1016/j.jmmm.2018.11.086
CZU: 538.9

Pag. 176-183

Jorba Pau1, Schulz Michael1, Hussey Daniel2, Abir Muhammad I.3, Seifert Marc1, Tsurcan Vladimir45, Loidl Alois4, Pfleiderer Christian1, Khaykovich Boris3
 
1 Technical University Munich,
2 National Institute of Standards and Technology,
3 Massachusetts Institute of Technology,
4 University of Augsburg,
5 Institute of Applied Physics
 
Disponibil în IBN: 2 februarie 2019


Rezumat

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 μm. 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.

Cuvinte-cheie
rystal growth, Magnetic domains, Magnetic phase transitions, Neutron imaging, Pressure techniques, Quantum phase transitions