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The Coercivity, also called coercive field or coercive force, is defined in a ferromagnetic material as the value of the applied external magnetic field to reduce the magnetization of a material (or sample) to zero after the sample has been magnetized to saturation. The magnetic parameter of Coercivity is a measure the resistance of a ferromagnetic material to becoming demagnetized.

ARkival measures the coercivity of magnetic material from a magnetic hysteresis loop measured with a vibrating-sample magnetometer (VSM). Coercivity is measured and reported in Oersted or ampere/meter units and denoted by Hc in the Hysteresis loop. In the VSM measurement, the coercivity Hc is measured by applying a (reverse) magnetic field  to reduce the sample magnetization to zero after the samples has been magnetized to saturation. Coercivity is defined from a Hysteresis loop at the point where H Field has a value at “0”. Ferromagnetic materials with high coercivity are called magnetically hard, and materials with low coercivity are said to be magnetically soft.

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