4.2 Hard magnetic materials
4.2 Hard magnetic materials
4.2 Hard magnetic materials
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Crystalline structure of R 2 Fe 14 B<br />
NdFeB magnets<br />
I-T curves for R 2 Fe 14 B<br />
s I<br />
Nucleation type magnets<br />
Magnetization reversal in sintered 2-14-1 magnets<br />
occurs by nucleation and growth of reversal domains.<br />
According to Kronmuller the coercivity is given by<br />
2Ku<br />
IHC = aKa eff<br />
Ψ<br />
−N I<br />
Is<br />
Here, a K describes the micro<strong>magnetic</strong> effects of anisotropy, wall width, and inhomogeneity size;<br />
a ψ describes the effects of grain misallignment. These two factors differ depending on whether wall<br />
motion is limited by pinning or nucleation. Experiments support nuclation form of this model.
Change language