Coercive /(?)/

Co·er·cive

Coercive

a.
  1. Serving or intended to coerce; having power to constrain.
    Coercive power can only influence us to outward practice.
    — Bp. Warburton.
    The power of resisting magnetization or demagnization is sometimes called coercive force.
    — S. Thompson.

Phrases & Compounds
Coercive force
the power or force which in iron or steel produces a slowness or difficulty in imparting magnetism to it, and also interposes an obstacle to the return of a bar to its natural state when active magnetism has ceased. It plainly depends on the molecular constitution of the metal.