In a hysteresis loop the retentivity and coercive force ae defined as follows:

Retentivity: the remaining value of magnetization when magnetic intensity is made zero depicted by length OC is known as retentivity of material

Coercive force: the value of magnetic intensity (H) needed to make magnetization zero is known as zero depicted by length OD is known as coercive force .

Now, for making a permanent magnet after magnetizing the material the magnetization should remain should retain to a large extent even when the magnetic field is removed (retentivity should be large)

Also, the magnetization should not be easily destroyed even if the material is exposed to stray magnetic fields (coercive force should be large)

Therefore, desirable properties for making a permanent magnets are high retentivity and high coercive force.