Underlayer for reference layer of polycrystalline CPP GMR sensor stack

摘要

Embodiments disclosed herein generally relate to a magnetic head having an amorphous ferromagnetic reference layer. The ferromagnetic reference layer may have amorphous structure as a result of an amorphous ferromagnetic underlayer that the ferromagnetic reference layer is deposited thereon. The amorphous ferromagnetic reference layer enhances magnetoresistance, leading to an improved magnetic head.

主权项

1. A magnetic head, comprising:
a sensor stack, wherein the sensor stack includes:
an antiferromagnetic layer;a first crystalline ferromagnetic underlayer;an amorphous ferromagnetic layer disposed on the crystalline ferromagnetic underlayer;a nonmagnetic layer disposed over the amorphous ferromagnetic layer;a second crystalline ferromagnetic underlayer disposed over the nonmagnetic layer; anda ferromagnetic free layer disposed on the second crystalline ferromagnetic underlayer.