Patent ID: 7854060

Claim:
A magnetic head substructure for use for manufacturing a magnetic head, the magnetic head comprising: a medium facing surface that faces toward a recording medium; a coil that generates a magnetic field corresponding to data to be written on the recording medium; and a pole layer that allows a magnetic flux corresponding to the magnetic field generated by the coil to pass therethrough and generates a write magnetic field for writing the data on the recording medium, the magnetic head substructure comprising: a substrate; and a plurality of sets of the coil and pole layer formed on the substrate so that a plurality of pre-head portions each of which is to become the magnetic head later are aligned in a plurality of rows, the magnetic head substructure being intended to be used such that it is cut later to separate the plurality of pre-head portions from one another, and a surface formed by cutting the substructure is lapped to thereby form the medium facing surfaces, the magnetic head substructure further comprising a plurality of sensors that respectively show individual sensor values corresponding to values of a plurality of different parameters each of which has an influence on characteristics of the magnetic head relating to the pole layer and each of which depends on a position of the medium facing surface, wherein: the plurality of sensors respectively show resistance values each of which varies according to the position of the medium facing surface, as the individual sensor values; the plurality of sensors are electrically connected to each other to form a composite sensor that shows a composite sensor value; and the composite sensor shows a resistance value that depends on the resistance values of the plurality of sensors, as the composite sensor value.