Stabilization of one or more upper sensors in multi-sensor readers

摘要

A multi-sensor reader that includes a first sensor that has a first sensor stack, which includes a sensing layer that has a magnetization that changes according to an external magnetic field. The first sensor also includes a first seed element below the first sensor stack. The multi-sensor reader also includes a second sensor stacked over the first sensor. The second sensor includes a second sensor stack, which includes a sensing layer that has a magnetization that changes according to the external magnetic field. The second sensor also includes a second seed element below the second sensor stack. The second seed element is structurally different from the first seed element and includes a stabilization feature.

主权项

1. A multi-sensor reader comprising:
a first sensor comprising:
a first sensor stack comprising a sensing layer having a magnetization that changes according to an external magnetic field; anda first seed element below the first sensor stack; and a second sensor stacked over the first sensor, the second sensor comprising:
a second sensor stack comprising a sensing layer having a magnetization that changes according to the external magnetic field; anda second seed element below the second sensor stack, wherein the second seed element is structurally different from the first seed element, and wherein the second seed element comprises a stabilization feature, and wherein the second seed element is not in contact with, and not coupled, to a separate bottom shield; and a shield synthetic antiferromagnetic (SAF) structure between the first sensor stack and the second seed element, and wherein the shield SAF structure and the second seed element are separated only by an insulation layer.