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coercivity |
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On magnetic media, the amount of electrical energy required to change the polarization of a bit. The coercivity of hard disks ranges from 500 to 2,000 Oersted. On magneto-optic media, it takes between 5,000 to 10,000 Oersted. See Oersted. |
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The geometry and coercivity advantages of perpendicular recording led scientists to believe in potential areal densities that are up to 10 times greater than the maximum possible with longitudinal recording. Higher Signal to Noise Ratio: Fujifilm scientists identified hexagon-shaped barium-ferrite magnetic particles as having the smaller size, higher coercivity and low noise needed to produce the high signal-to-noise ratio required for high density recording media; and However, as the needle-like magnetic particles become smaller, both coercivity (ability to retain magnetic energy) and saturation magnetization (amount of magnetic energy) that are essential for increasing recording capacity and density tend to decrease. |
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coercivity
