Magnetic phase diagram of barium hexaferrite single crystal of barium hexaferrite type-M-$\mathrm{BaFe_8Co_2Ti_2O_{19}}$ (based on neutronographic analysis)
Abstract:
Neutronographic studies of the simple spiral magnetic structure (SS) of $\mathrm{BaFe_8Co_2Ti_2O_{19}}$ with hexagonal crystal structure of type-M in a wide temperature range and in horizontal magnetic fields perpendicular to the basic plane of the sample (parallel to the C axis) have been carried out. A helix-collinear antiferrmagnetic transition was obtained in a magnetic field of 1.8T and a temperature of 120K. The magnetic phase diagram (H,T) is constructed. The technique of blow-off with an electromagnet and a two-coordinate detector is used, which can be, in a number of neutronographic experiments, simpler and more economical than the use of cryomagnets, for example, for the study of neutron multilayer mirrors and small-angle neutron scattering. It is also very possible to use cryostats with a small diameter shank (10–15 mm) together with an electromagnet in case of the need for studies at lower temperatures and small-angle neutron scattering.
Keywords:M-type hexaferrite, single crystal, neutron diffraction, electromagnet, magnetic spiral, blow-off method, nitrogen gas.
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