Top Nd-Fe-B magnets with greater than 56 MGOe energy density and 9.8 kOe coercivity

Exchange spring behaviour in SrFe12O19-CoFe2O4 nanocomposites

“…2 However, until now, experimentally, one could achieve only up to ∼56 MGOe. 10 Though these metallic magnets possess higher magnetic energy products, their applications are mostly hindered by their high cost of synthesis and less corrosion resistance. In this regard, hard ferrites are more popular in terms of applicability; but ferrites exhibit a very low magnetic energy product compared to the metallic permanent magnets.…”

Grain alignment and microstructure of (Nd,Dy)12.8(Fe,M) 80.7B6.5 by strip casting

“…Recently, sintered Nd-Fe-B magnets produced from strip cast alloys has been studied extensively due to their high permanent magnetic properties [1][2][3][4]. With adequate chemical composition, sintered magnets prepared from strip cast alloys have a higher alignment coefficient, low rare-earth content, high fraction of the hard magnetic phase and high permanent magnetic properties.…”

“…The highest maximum energy density of sintered magnets prepared from strip cast alloys reached to 444 kJ/m 3 (55.8 MGOe) in 2000 [1]. Rodewald et al prepared sintered Nd-Fe-B magnets with maximum energy density 451 kJ/m 3 (56.7 MGOe) in 2002 [3]. The alignment coefficient, the volume fraction, the distribution of grain size of the hard magnetic grains, the overall oxygen and carbon content of the sintered magnets are important factors influencing magnetic properties [5][6][7].…”

“…Up to now the studies mainly focus on the HD process, particle size and distribution, additional elements, sintering process and heat treatment, etc. [1][2][3][4][5][6][7][8][9][10]. However, with a fixed composition, the alignment coefficient and the distribution of grain size of the hard magnetic grains in sintered magnets will be influenced by the alignment and microstructure of the strip cast alloy (the master alloy).…”

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

“…In the following years, energy products as high as 56 MGOe were achieved by Rodewald et al [13] through careful control of the composition and processing.…”