4.2 Hard magnetic materials
4.2 Hard magnetic materials
4.2 Hard magnetic materials
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Various magnets<br />
1. Alnico : Single domain, Shape anisotropy, good thermal stability<br />
Spinodal decomposition<br />
Fe 2 NiAl<br />
Fe-rich α phase<br />
NiAl-rich α’ phase<br />
850 2h then quenching<br />
Fe x Co 1-x NiAl<br />
Coercivity by shape anisotropy<br />
Hc<br />
∝ ΔI( N −N<br />
)<br />
Δ I = I −I<br />
α<br />
2 1<br />
α '<br />
N: demagnetization factor
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