The perpendicular magnetic head fabrication and testing method includes
the additional fabrication of magnetic pole testing structures in the
kerf area of the wafer substrate. Particularly, magnetic interconnect
pieces are fabricated in the kerf area to magnetically connect an
extending portion of the first magnetic pole with an extending portion of
the second magnetic pole. As a result, when the perpendicular magnetic
heads are fabricated at the wafer level, the first and second magnetic
poles are interconnected through structures located in the kerf area.
Thereafter, an ISAT magnetic pole test can be conducted by passing
electrical current through the induction coil of the magnetic head, and
magnetic flux will flow through the interconnected magnetic pole
structure, thereby enabling the testing of the magnetic poles of the
perpendicular magnetic head at the wafer level.