We imagine a magnetic tape of them utilized currently in the stereo decks. Basically it consists of a plastic film on
which a fine layer of magnetic material is deposited. Even when the plastic
support and the agglutinating elements are very important for the smooth
operation of the tape, the magnetic layer is the medium that allows recording,
and therefore must be a ferromagnetic material.
In most cases different
varieties of iron oxide are used although in recent years new materials have
appeared suitable for that purpose. The magnetic particles, which can be
considered as a multitude of small magnets, are physically aligned, during
manufacture, by means of a magnetic process in such a way that their larger
dimension is in general correspondence with that of the tape.
In this way they
can be magnetized in one direction or another depending on the magnetic field
applied to them. All the substances ferromagnetic, and of course the sensitive
layer of a tape tape, are magnetized under the effect of a magnetic field.
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