Probing Short-Range Magnetic Order in Magnetocaloric HoF3
The development of magnetocaloric materials optimised for cooling between 4 and 20 K is a promising route to replace increasing scarce and expensive liquid He. The requires the development of new optimised magnetocalorics that work efficiently for small applied field changes that can be achieved using permanent magnets; such properties appear to be strongly associated with ferromagnetic chains coupled with magnetic frustration. HoF3 appears to be a particularly promising material in this regard with a structure incorporating face-sharing chains of Ho cations giving magnetocaloric performance that only modestly declines with increasing temperature above 4 K. This experiment will measure the magnetic diffuse scattering of this material from a polycrystalline sample using XYZ polarisation. This data will be analysed using reverse Monte Carlo refinements to determine the nature of the magnetic anisotropy and interactions within this material and how these change with temperature. Understanding gained from this will enable the development of precise design rules for developing improved magnetocaloric materials capable of reducing dependence on liquid He in the longer term.
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SAINES Paul; DIXEY Richard and WILDES Andrew. (2021). Probing Short-Range Magnetic Order in Magnetocaloric HoF3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-910
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