Microstructure refinement and significant improvements of magnetic properties in Pr2Fe14B/α-Fe nanocomposites

Effect of Pr concentration on the magnetic properties and phase evolution of Ti-substituted PryFe88−yTi2B10 (y=9.5–7) nanocomposite ribbons

“…For further understanding the exchange coupling effect between adjacent grains in the Pr 8.5 Fe 79.5 M 2 B 10 ribbons, the Henkel plots (δM versus H) which have been successfully used by many researchers to study the nature of interactions between phases in nanocomposite magnets are employed [8,[16][17][18]. The δM is defined as m d (H) − [1 − 2m r (H)], where m d is the reduced demagnetization remanence and m r the reduced magnetization remanence [19,20].…”

Underwater Explosive Shock Consolidation of Nanocomposite Pr<SUB>2</SUB>Fe<SUB>14</SUB>B/&alpha;-Fe Magnetic Powders

“…The saturation magnetization M s was extracted from the hysteresis loop measurements by plotting the curve of M versus 1=H 2 and extrapolating the curve to infinite H. Although the samples consist of magnetically hard and soft phases, smooth single-phase like hysteresis loop with a remanence ratio (i.e., squareness factor M r =M s 0:6) over 50% are observed in the explosively consolidated compacts, indicating effective exchange coupling between hard mangetic Pr 2 Fe 14 B and soft magneticFe phases. The magnitude of squareness factor is one of extrinsic magnetic properties, and is very sensitive to local structural properties, 22,23) such as defects, grain size, and strain, and it also relates to the effects of grain alignment and exchange interaction. The squareness is lower compared to those values (0:680:82) of sintered anisotropic magnets, 18) which is due to the isotropic characteristic of nanocomposites and the existence of magnetically soft phases that result in the reversal of nucleation fields at low magnetic field.…”

Fabrication and Magnetic Properties of \(\text{Nd}_2\text{Fe}_{14}\text{B/Fe}_{65}\text{Co}_{35}\) Hard Magnetic Ribbons

“…In general, the (BH) max could get value beyond the threshold of 20 MG.Oe, but mainly the values were given in the range of 12 -18 MG.Oe [2][3][4][5][6][7][8][9][10][11][12]. As reported the (BH) max threshold values were achieved by using complex technologies [13,14]. For example, the value of 20.3 MG.Oe was achieved in [13] by using a diversity of original alloy (Pr, Tb) 2 (Fe, Nb, Zr) 14 B/α-Fe and with a strict control of microstructure to get an uniform distribution of α-Fe, but the repetition of this technology faces many difficulties.…”