Normal magnetic coercivity ($H_{cB}$)

The magnitude of reverse magnetic field strength at which a previously magnetized specimen's magnetic flux density $B$ vanishes on a specified magnetic hysteresis branch. Intrinsic magnetic coercivity instead refers to zero magnetization. Because $B={\mu }_0(H+M)$, their zero conditions generally occur at different applied fields. The preparation, branch and specimen geometry must be specified when comparing measurements.