Method of testing head slider and method of manufacturing head gimbal assembly

Abstract

A method includes a head-slider manufacturing process that manufactures a head slider composed of a sensor section and a slider main body. The sensor section has a tunnel magnetoresistive film and a pair of electrode films. The method further includes: a measurement process that measures a difference between an impedance between one of the electrode films and the slider main body and an impedance between the other electrode film and the slider main body; and a determination process that determines whether the difference in the impedances is within a predetermined value or not. The method further includes: a head-gimbal-assembly assembling process that assembles a head gimbal assembly by using the head slider for which it is determined that the difference in the impedances is within the predetermined value; and a HDD assembling process that assembles a HDD by using the head gimbal assembly.

Dependencies are inferred from the claim text.