This phenomenon is called hysteresis and the remaining magnetic field is called remanent magnetism.

This effect is known as lightning-induced remanent magnetism, or LIRM.

Because the Moon has no currently active global magnetic field, these regional anomalies are regions of remanent magnetism; their origin remains controvertible.

Each of the samples is measured in a spinner magnetometer to determine the thermal remanent magnetism of each sample.

Analyses of natural remanent magnetism (NRM) in rocks which reflects orientation and intensity of earth's magnetic field at time of rock formation.

After the source of the magnetic flux is turned off, remanent magnetism is left in ferromagnetic circuits, creating a flux with no MMF.

Measurements of remanent magnetism in a variety of volcanic rocks found on the continents had shown that some were magnetized in the opposite direction to the Earth's present magnetic field.

When the generator first starts to turn, the small amount of remanent magnetism present in the iron core provides a magnetic field to get it started, generating a small current in the armature.

S.K. Runcorn and his associates, working in Britain, conducted an intensive programme of data collection involving the measurement of remanent magnetism in rocks of various ages from around the world.

Moreover, the weakness of the remanent magnetism contained within volcanic rocks together with various sources of error meant that large numbers of individual measurements had to be averaged in order to provide a reasonably precise estimate of past continental positions.