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

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;
• and
• a first seed layer below the first sensor stack;
• and
• a plurality of sensors stacked over the first sensor, wherein at least one of the plurality of sensors comprises:
• a second sensor stack comprising a sensing layer having a magnetization that changes according to the external magnetic field;
• a second seed layer below the second sensor stack;
• and
• a stabilization element in contact with the second seed layer,
• wherein the stabilization element is in direct contact with an insulation layer between the first sensor stack and the second sensor stack.

A reader comprising:

• at least one sensor comprising:
• a sensor stack comprising a sensing layer having a magnetization that changes according to an external magnetic field;
• a sensor antiferromagnetic layer;
• a seed layer below the sensor stack, the seed layer having a top surface in contact with the sensor antiferromagnetic layer;
• and
• a stabilization element that maintains a magnetization direction of the seed layer and stabilizes the seed layer, the stabilization element being in contact with a bottom surface of the seed layer.