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coercivity

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co·er·civ·i·ty  (kr-sv-t)
n.
The intensity of the magnetic field needed to reduce the magnetization of a ferromagnetic material to zero after it has reached saturation.
coercivity [ˌkəʊɜːˈsɪvɪtɪ]
n
(Physics / General Physics) the magnetic-field strength necessary to demagnetize a ferromagnetic material that is magnetized to saturation. It is measured in amperes per metre Compare coercive force
coercivity  (kr-sv-t)
The magnetic flux density needed to reduce the magnetization of a material (especially a ferromagnetic material) from complete saturation to zero. Coercivity is measured in teslas. Compare remanence.


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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.
Perpendicular recording: opening the doors for 10-fold hard drive ... by Best, John / Computer Technology Review
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
Fujifilm Technology Key to IBM Demo of Multiple Terabyte Storage; IBM ... by Business Wire
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.
High performance media for high performance drives by D'Ambrise, Rich / Computer Technology Review
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