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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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