Full-track profile derivative method for track width measurements of magnetic recording head

Since a full-track profile is the convolution of reader response function of magnetic field and magnetization distribution of data track, its derivative depends strongly on the spatial function of magnetoresistive sensor sensitivity, especially regarding information about magnetic read width (MRW) and side reading. Therefore, effectively extracting this information from the derivative of a full-track profile allows the possibility to obtain accurate value of MRW and to calculate the effect of side reading on magnetic write width (MWW) of magnetic recording heads. How to achieve this goal will be discussed in this paper.