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Coercivity
The level of demagnetizing force that would need to be applied to a tape or magnetic particles to reduce the remanent magnetization to zero. Measured in Oersteds.
A demagnetizing field of a level in excess of the coercivity must be applied to a magnetic particle in order to coerce it to change the direction of its magnetization. Coercivity is the property of a tape that indicates its resistance to demagnetization and determines the maximum signal frequency that can be recorded by a tape.
Hc is the common abbreviation for coercivity.
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