Methods of manufacturing magnetic heads with reference and monitoring devices
View Patent ↗According to one aspect, an exemplary method for manufacturing a magnetic head includes forming a plurality of magnetoresistive devices, a reference device, and a monitoring device, where the reference device includes a desired stripe height less than the magnetoresistive devices and monitoring device. Material is removed from the air/tape bearing surface, e.g., by lapping, thereby reducing the stripe height of the magnetoresistive devices and monitoring device. A characteristic of the reference device, e.g., resistance, voltage, or the like, is compared with a similar characteristic of the monitoring device, wherein the characteristic of the monitoring device varies as material is removed. Material may be removed from the bearing surface until the characteristic of the monitoring device and the reference device are substantially equal, at which time, the stripe height of the monitoring device and magnetoresistive devices are substantially equal to that of the reference device.
1. A method for manufacturing a magnetic head, comprising,
forming a plurality of magnetoresistive devices and an electronic lapping guide, the electronic lapping guide including a reference device and a monitoring device, wherein the magnetoresistive devices, the reference device, and the monitoring device are formed in the same manner, and the reference device is formed having a stripe height less than the magnetoresistive devices;
measuring an electrical characteristic of the reference device and an electrical characteristic of the monitoring device; and
lapping a bearing surface including the magnetoresistive devices, the monitoring device, and the reference device until the electrical characteristic of the reference device and the electrical characteristic of the monitoring device are substantially equal.
2. The method of claim 1 , wherein the reference device is formed having a stripe height defined by a photolithographic process.
3. The method of claim 1 , wherein the monitoring device and the reference device are formed adjacent the magnetoresistive devices.
4. The method of claim 1 , further comprising sending at least one electrical signal through the reference device and the monitoring device to determine the electrical characteristic of the reference device and the electrical characteristic of the monitoring device.
5. The method of claim 1 , wherein the magnetoresistive devices include anisotropic magnetoresistive devices or giant magnetoresistive devices.