Meltspun permanent magnet materials containing Fe3B as the main phase

Prospects for nanoparticle-based permanent magnets

“…This concept of exchange coupling brought a new hope for the improvement of (BH) max of permanent magnets [47][48][49][50][51][52][53]. For an efficient exchange coupling, the characteristic dimension of the soft phase cannot exceed about twice the wall thickness of magnetic domains in the hard phase, which typically limits the size of the soft grains to ~10 nm, and the volume fraction of the soft phase must not be too high in order to lose a large H c value, which limits the (BH) max of the composite [50][51][52].…”

Generation and Characterization of Anisotropic Microstructures in Rare Earth-Iron-Boron Alloys

“…Isotropic exchange spring magnets have been successfully realized through melt-spinning, followed by either polymer-bonding [63,64] or spark plasma sintering [65]. However, a challenge still exists to successfully create these in an anisotropic form.…”

Length scales of interactions in magnetic, dielectric, and mechanical nanocomposites

“…(4), but in general the finite saturation magnetization puts a limit to the applicability of the Bruggeman theory. Hard-soft nanocomposites magnets for permanent-magnet applications, which have been investigated quite intensively [4,9,22,41], exhibit nontrivial nanoscale interactions. In these materials, the energy product is determined by the coercivity, which is, in a crude nucleation-field approximation [4,9], obtained as the lowest-lying H eigenvalue of (7) Here A is the exchange stiffness and K, is the first uniaxial anisotropy constant.…”