Development of high coercivity anisotropic Nd-Fe-B/Fe nanocomposite powder using hydrogenation disproportionation desorption recombination process

Production of Fe nanoparticles from γ-Fe2O3 by high-pressure hydrogen reduction

“…Exchange-coupled nanocomposite magnets for remanence and maximum energy product enhancement, consisting of nanoscale a-Fe as the magnetically so phase and SmCo 5 , Nd 2 Fe 14 B or Sm 2 Fe 17 N 3 as the hard phases, have been investigated. [5][6][7][8] Furthermore, the potential in biomedical applications, such as magnetic resonance imaging 9 or hyperthermia mediated drug release for cancer therapy 10 has also been discussed if a proper surface coating (e.g. Au) is provided.…”

Magnetic Properties of SmCo5 + 10 wt% Fe Exchange-Coupled Nanocomposites Produced from Recycled SmCo5

“…In this work, we explore the possibility of improving on the sustainability aspect by creating exchange-coupled nanocomposites from recycled SmCo 5 magnets [ 21 , 22 , 23 ] (90 wt%) and a cheap and available 3d metal (Fe, 10 wt%). While most of the recent work in this area is on Nd 2 Fe 14 B+Fe nanocomposites [ 24 , 25 , 26 , 27 , 28 ], the choice of recycled SmCo 5 was made due to the relative purity of these industrial magnets compared with other compositions [ 2 , 3 ]. These types of materials could minimize purchase and environmental costs due to critical elements, adding to the savings accrued by enhanced magnetic properties.…”

Impact of soft magnetic α‐Fe in hard Nd2Fe14B magnetic materials: A micromagnetic study

“…A comparison of the simulation results with the findings from ref. [11] gives rise to further analysis, since here α‐Fe phase inclusions about 100 nm in size appear to couple effectively. However, the microstructures were different there.…”

“…Although the FEM is found to be numerically more expensive, compared to the finite difference method (FDM), its flexibility in discretizing heterogeneous microstructures provides a superior advantage, compare [10]. Micromagnetic simulations are applied nowadays in many applications to reveal magnetic interaction mechanisms, as the impact of exchange decouplings of grains [6], the influence of microstructural distortions [5, 11] or to analyze shape and size effects [12] on the critical magnetization reversal processes. A crucial challenge of micromagnetism is the conservation of the length of the magnetization vector $$\bm{M}=M_{\rm s}\bm{m}$$, where M s is the material‐specific saturation magnetization and m represents the magnetic unit director.…”