Low-Temperature Magnetic Hysteresis in Nd(Pr)-Fe-B Nanostructured Alloys with Nd₂Fe₁₄B Type Main Phase Composition

Abstract

Magnetic hysteresis properties of nanostructured industrially manufactured Nd-Fe-B and Pr-Fe-B alloys on the base of a tetragonal Nd2Fe14B (2-14-1) hard magnetic phase (MQP-B, MQP-B+ and MQP-16-7 brands) have been investigated at 4.2 K in magnetic fields up to 58 T. The chemical composition of the alloys given in the certificates was defined more precisely. The grain sizes of the main 2-14-1 phase were determined. The average grain size is much smaller than a critical single domain diameter. Coercivity, remanence magnetization, saturation magnetization and maximal magnetic energy product were determined at 4.2 K and compared with those obtained at room temperature.

Magnetic Properties of Nanocrystalline (Nd,R)-(Fe,Co)-B (R = Pr, Ho) Alloys after Melt Spinning, Severe Plastic Deformation and Heat Treatment

“…Modern hard magnetic materials of R2Fe14B-type are multicomponent systems with hysteresis properties provided by not only a careful choice of chemical composition of alloy but mainly methods of its treatment [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The studies of relation between microstructure and magnetic characteristics are in focus for both known and new alloys [15,16].…”

Investigation of the possibility of Pr₂Fe₁₄B/α-Fe composite obtaining by Pr–Fe–B alloy oxidation in a fluidized bed jet mill

“…Особое значение имеют магнитотвердые композиты на основе сплавов Pr-Fe-B ввиду их высоких гистерезисных характеристик при низких и сверхнизких температурах, что делает такие МТМ незаменимыми при использовании в криогенной и космической технике [11][12][13][14].…”