Optimization of the magnetic properties of nanostructured Y-Co-Fe alloys for permanent magnets

Abstract

The structural and magnetic properties of ball-milled Fe-doped Y Co5−xFex(0 ≤ x ≤ 0.5) were investigated. The magnetization increases with Fe-doping up to the solid solubility limit, x = 0.3 without destroying the crystal structure or degrading the coercivity. A special magnet array is designed using ring magnets for pressing the powders under magnetic field in order to achieve magnetic alignment. A dramatic increase in magnetization is observed for magnetically aligned Y Co4.8Fe0.2 pressed ingots.

Thermodynamics and Magnetism of YCo5 Compound Doped with Fe and Ni: An Ab Initio Study

“…It has been explored both experimentally and theoretically in the past due to its unique qualification as a "gap" permanent magnetic material [5,. Actually, almost all experimental papers on the YCo 5 magnet have been dedicated to studying MAE of the undoped magnet as well as doped with Sm, Nd, Ge, Fe, Cu, and Ni [5,[10][11][12][13][14][15][16][17][18][19][20][22][23][24][25][26][27][28][29][31][32][33][34][35][41][42][43][52][53][54]62,66,70,[72][73][74]77,80]. MAE, the Curie temperature, and the energy product, which are 5.7 MJ/m 3 , 921 K, and 224 kJ/m 3 , correspondingly, were first reported in refs.…”

“…Furthermore, Fe is a ferromagnetic metal with a very substantial magnetization at room temperature (1.76 MA/m [7]). The YCo 5 magnet doped with iron has been the subject of numerous experimental papers [13,18,20,34,35,41,42,52,72,73,80]. Replacing all cobalt with iron to enhance magnetization in the YFe 5 compound produces a thermodynamically unstable phase, which is not experimentally observed within the equilibrium Y-Fe phase diagram.…”

Development of Co-lean (Sm,Y)(Fe,Co,Ti)12 compounds with large saturation magnetization

“…Figures 4(a The Y atom has no 4 f electrons, and it only contributes to the anisotropy via the hybridization of its 4d electrons with 3d electrons of Fe or Co atoms. [36][37][38] The anisotropy for RE-TM compounds is mainly originated from the crystal field interactions of 4 f electrons of Sm with the electrostatic charge of surrounding ions. Hence, introducing Y in Sm(Fe 0.8 Co 0.2 ) 11 Ti 1 for x = 0.1 led to an abrupt decrement of μ 0 H a [Fig.…”