Permanent Magnets Elaboration from BaFe12O19 Hexaferrite Material: Simulation and Prototype

Magnetic and Structural Properties of Barium Hexaferrite BaFe12O19 from Various Growth Techniques

Barium hexaferrite powder samples with grains in the μm-range were obtained from solid-state sintering, and crystals with sizes up to 5 mm grown from PbO, Na₂CO₃, and BaB₂O₄ fluxes, respectively. Carbonate and borate fluxes provide the largest and structurally best crystals at significantly lower growth temperatures of 1533 K compared to flux-free synthesis (1623 K). The maximum synthesis tempe...

Nonlinear Numerical Simulation of Permanent Magnets

Rare earth permanent magnet models are commonly used in the design of undulators and wigglers. Normally the operating point of the magnet in the B vs. H diagram corresponds to a linear reversible characteristic. The region of linearity is strongly dependent on the temperature. The operation of part of the magnet blocks in the region of non-linearity is responsible for the so-called irreversible...

The mechanically induced structural disorder in barium hexaferrite, BaFe12O19, and its impact on magnetism.

The response of the structure of the M-type barium hexaferrite (BaFe12O19) to mechanical action through high-energy milling and its impact on the magnetic behaviour of the ferrite are investigated. Due to the ability of the (57)Fe Mössbauer spectroscopic technique to probe the environment of the Fe nuclei, a valuable insight on a local atomic scale into the mechanically induced changes in the h...

Method of making permanent magnets

New Material for Permanent Magnets on a Base of Nd and Fe

A new compound composed of Nd, Fe, and a small quantity of B about 1 weight has been found, which has a tetragonal structure with lattice constants a = 0.880 nm and c = 1.221 nm. This phase, which has the approximate composition, 12 atom Nd, 6 atom B and balance Fe, possesses remarkable magnetic proper ties. From the approach to saturation an anisotropy con stant of about 3.5 MJ/m3 can be calcu...