The material of a permanent magnet has:

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(D) permanent magnet is a material that retains its magnetism even after the external magnetic field is removed. To achieve this,the material must hav

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High retentivity,high coercivity

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(D) permanent magnet is a material that retains its magnetism even after the external magnetic field is removed. To achieve this,the material must have high retentivity so that it can retain a large amount of magnetic flux density $(B)$ at zero external field $(H=0)$. Additionally,it must have high coercivity so that it is not easily demagnetized by external magnetic fields or temperature fluctuations. Therefore,the material of a permanent magnet should have high retentivity and high coercivity.

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