These materials may acquire a residual field from a number of sources.
2.
Residual magnetism is considered to " block out " non-residual fields.
3.
When individual molecules, which are magnetic dipoles, are held in alignment by being bound in a crystalline structure, the small fields reinforce each other to form the rock's residual field.
4.
The mechanism of action is the same as in demagnetizing : the large AC signal acts as a demagnetizing signal that decays exponentially as the tape head moves along, while the audio signal is the residual field that remains imprinted on the magnetic media.
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