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4.2 Hard magnetic materials

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Magnetic properties for various permanent magnet alloys<br />

Material Saturation Anisotropy Anisotropy Curie (BH) max Single<br />

magnetization energy field temperature domain<br />

I S K u H K T C size r c<br />

J/m 3 A/m kJ/m 3 ) (μm)<br />

SmCo 5 1.1 1.5 x 10 7 2.3 x 10 7 725 240 1.7<br />

Sm 2 Co 17 1.28 3.2 x 10 6 5.6 x 10 6 926 326 0.6<br />

Nd 2 Fe 14 B 1.6 4.3 x 10 6 5.3 x 10 6 320 510 0.3<br />

Ba-Ferrite 0.48 3.3 x 10 5 1.1 x 10 5 450 39<br />

Theory (I s<br />

2<br />

/4μ 0<br />

)<br />

r c<br />

= 9γμ 0<br />

/2I s<br />

2

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