Abstract

In our life, the magnetic field is omnipresent. It is a field generated by Earth superimposed on field coming from outer space combined with magnetic pollution. Presence of this field causes also that magnetic materials act as a secondary magnetic field source due to the demagnetizing field. This field known as magnetic signature is often used for detection of magnetic objects, for example, sea ships. Moreover, magnetic history of the formation of the Earth’s crust is available in rocks and stones and disciplines studying such effects are known as paleomagnetism and archeomagnetism.