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Magnetically Hard Materials

 

Magnetically hard materials are used for making permanent magnets and have the following characteristics:

  1. They possess high value of BH product.
  2. High retentivety.
  3. High coercivity.
  4. Strong magnetic reluctance.
  5. Hysteresis loop is more rectangular in shape.

Important magnetically hard materials are enumerated below:

  1. Tungsten steel
  2. Cobalt steel
  3. Chromium steel
  4. Alnico
  5. Curife
  6. Hypernic