Abstract
A three-dimensional finite element model was performed to study the magnetization reversal of (CexNd1-x)2Fe14B nanocomposite permanent magnets. The influences of volume fraction, width and performance parameters of the grain boundary (GB) composition on the coercivity were analyzed by the method of micromagnetic simulation. The calculation results indicate that the structure and chemistry of GB phase play important roles in Nd2Fe14B-based magnets. An abnormal increase in the value of coercivity is found to be connected with the GB phase, approximately when the percentage of doped cerium is between 20% and 30%. While the coercivity decreases directly with the increase in cerium content instead of being abnormal when there is no GB phase in magnets at all or the value of magnetocrystalline anisotropy or exchange integral is too large.
Highlights
Since the advent of Nd-Fe-B magnets in 1980s,1 it has become the most widely used rare earth permanent magnets, which is the key material for lots of equipments such as computer peripherals, vibratory motors, loudspeakers and so on.[2]
When the grains are contacted without any grain boundary (GB) phases, the coercivity directly reduces with the increase of Ce addition
After a peak at x = 0.25, the coercivity decreases gradually. It might be the distribution of the GB phase between the grains that led to the phase separation, which influence the nucleation of reversed domain and coercivity
Summary
Since the advent of Nd-Fe-B magnets in 1980s,1 it has become the most widely used rare earth permanent magnets, which is the key material for lots of equipments such as computer peripherals, vibratory motors, loudspeakers and so on.[2].
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