Investigation on magnetic properties of parallel and perpendicular oriented Nd2Fe14B/Fe65Co35/Nd2Fe14B films by the micro-magnetism finite element method

Micromagnetism simulation on effects of soft phase size on Nd2Fe14B/α–Fe nanocomposite magnet with soft phase imbedded in hard phase

“…Zhang et al [14] simulated the effects of grain size and texture on the magnetic properties and the magnetic reversal behavior of three-dimensional (3D) nanocomposite magnet by micromagnetic finite element. It was also found in our previous work [15] that all the demagnetization curves with thickness in a range of 2 nm-30 nm of the perpendicular orientation trilayers exhibit "single phase" behavior, while noticeable kinks are present in the demagnetization curves of the parallel orientation Nd 2 Fe 14 B/Fe 65 Co 35 /Nd 2 Fe 14 B trilay-ers with the soft phase thickness equal to or larger than 12 nm. The same phenomenon was also found in the micromagnetic simulation results of 3D Nd 2 Fe 14 B/α-Fe multilayers.…”

Matching the experimental chemical composition configuration and theoretical model in Nd2Fe14B/α-Fe nanocomposites to improve coercivity

“…The models bear the same size of 90 nm  100 nm  20 nm, and the same softmagnetic phase content of about 20 vol%. Here, the magnetic parameters 30,31 of the soft-magnetic phase (a-Fe) and the hardmagnetic phase (Nd 2 Fe 14 B) are used for simulation, in which a saturation magnetization (M s ) of 21.5 kG, a magnetocrystalline anisotropy constant (K 1 ) of 0.046 MJ m À3 , and an exchange integral constant (A) of 25 pJ m À1 for the soft-magnetic phase, and a M s value of 16.1 kG, a K 1 value of 4.3 MJ m À3 , and an A value of 7.7 pJ m À1 for the hard-magnetic phase.…”

“…It is clear that a breakthrough in the magnetic properties of Nd-Fe-B magnets is impossible to be achieved, and no stable compound superior to Nd 2 Fe 14 B has been found. 3 The nanocomposite magnet, [4][5][6][7][8][9][10] a metamaterial formed by the combination of soft and hard-magnetic phases at the nanoscale, which has an ultra-high theoretical (BH) max value, has become one of the research hotspots of permanent magnetic materials. In addition to high theoretical (BH) max (over 90 MGOe) for Nd 2 Fe 14 B/a-Fe nanocomposites, 11 the addition of a large number of cheap softmagnetic metals/intermetallics in nanocomposite magnets can also effectively reduce the cost of raw materials and save rare earth resources.…”