Magnetoresistive device with lapping guide treated to eliminate magnetoresistive effect thereof

摘要

A method for reducing noise in a lapping guide. Selected portions of a Giant magnetoresistive device wafer are masked, thereby defining masked and unmasked regions of the wafer in which the unmasked regions include lapping guides. The wafer is bombarded with ions such that a Giant magnetoresistive effect of the unmasked regions is reduced. The GMR device is lapped, using the lapping guides to measure an extent of the lapping.