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.
Highlights
The main concern in the material choice is the energy product, which quantifies the ability of the magnet to store magnetostatic energy and create flux in the surrounding space.[4]
The maximum possible value (BH)MAX = 1/4 μ0Ms2 is reached with a demagnetization factor N = 1/2. It can be approximated with a compact cylindrical magnet with height equal to radius (r ≈ h) that exhibits a rectangular M(H) loop. For this Hc must be greater than Ms/2 where Ms is related to the intrinsic atomic and crystal structure and Hc originates from the magnetic anisotropy K
Increasing the annealing time decreases the maximum energy product overall and the maximum value of 66 kJ/m3 is obtained for a 2 min annealed samples
Summary
Permanent magnets are used in many applications in the electric, computer, green energy, automotive and domestic areas.[1,2,3] The main concern in the material choice is the energy product, which quantifies the ability of the magnet to store magnetostatic energy and create flux in the surrounding space.[4] Improving extrinsic and intrinsic properties by nanostructuring and atomic structuring (crystal structure, composition) is the way to maximize the energy product.[5] The maximum possible value (BH)MAX = 1/4 μ0Ms2 is reached with a demagnetization factor N = 1/2 It can be approximated with a compact cylindrical magnet with height equal to radius (r ≈ h) that exhibits a rectangular M(H) loop. Magnetic field will be investing in order to obtain a hard magnet which will be in the gap between oriented ferrite (34 kJ/m3) and Nd-Fe-B (350 kJ/m3)
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