Physics for Information Science: Unit III: Magnetic Properties of Materials

Energy Product

Magnetic Properties of Materials

Hard magnetic materials have high magnetisation, retentivity and coercivity. The shape of the hysterisis loop in the second quadrant gives the effectiveness of permanent magnetism in the specimen.

ENERGY PRODUCT

Hard magnetic materials have high magnetisation, retentivity and coercivity. The shape of the hysterisis loop in the second quadrant gives the effectiveness of permanent magnetism in the specimen.

Therefore, a product of retentivity (Mr) and coercivity (Hc) is made and this product is called energy product, which gives the maximum amount of energy stored in the specimen.


The energy product curve is as shown in Fig. 3.27. Here two curves (i.e.,) (i) 1st quadrant of the plot between energy product (MrHc) and Mr which represents magnetisation and (ii) 2nd quadrant of M-H curve which represents the demagneti- sation are joined together to from a single curve. Thus from the energy product curve, maximum value of energy stored (MrHc) in the specimen can be obtained.

Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : Magnetic Properties of Materials - Energy Product