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US 2016/0078888 A1Published application
Underlayer for reference layer of polycrystalline cpp gmr sensor stack
AssigneeHGST Netherlands B.V.
InventorsJeffrey Robinson CHILDRESS, Young-Suk CHOI, Tomoya NAKATANI, John Creighton READ
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Abstract
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.
Claims20
A magnetic head, comprising:
- a sensor stack, wherein the sensor stack includes:
- an antiferromagnetic layer;
- a first crystalline ferromagnetic underlayer;
- an amorphous ferromagnetic reference layer disposed over the crystalline ferromagnetic underlayer;
- a nonmagnetic layer disposed on the amorphous ferromagnetic reference layer;
- a second crystalline ferromagnetic underlayer disposed over the nonmagnetic layer;
- and
- a ferromagnetic free layer disposed on the second crystalline ferromagnetic underlayer.
5 more elements
A magnetic head, comprising:
- a sensor stack, wherein the sensor stack includes:
- an antiferromagnetic layer;
- a ferromagnetic pinned layer disposed on the antiferromagnetic layer;
- a first nonmagnetic layer disposed on the ferromagnetic pinned layer;
- a first crystalline ferromagnetic underlayer disposed on the first nonmagnetic layer;
- an amorphous ferromagnetic reference layer disposed over the first crystalline ferromagnetic underlayer;
- a second nonmagnetic layer disposed on the amorphous ferromagnetic reference layer;
- a second crystalline ferromagnetic underlayer disposed on the second nonmagnetic layer;
- and
- a ferromagnetic free layer disposed over the second crystalline ferromagnetic underlayer.
7 more elements
A hard disk drive, comprising:
- a magnetic media;
- a magnetic write head;
- and
- a magnetic read head, wherein the magnetic read head includes:
- a sensor stack, wherein the sensor stack includes:
- an antiferromagnetic layer;
- a first crystalline ferromagnetic underlayer disposed over the antiferromagnetic layer;
- a first amorphous ferromagnetic underlayer disposed over the first crystalline ferromagnetic underlayer;
- an amorphous ferromagnetic reference layer disposed over the first amorphous ferromagnetic underlayer;
- a first nonmagnetic layer disposed over the amorphous ferromagnetic reference layer;
- a second crystalline ferromagnetic underlayer disposed over the first nonmagnetic layer;
- a second amorphous ferromagnetic underlayer disposed over the second crystalline ferromagnetic;
- and
- an amorphous ferromagnetic free layer disposed over the second amorphous ferromagnetic underlayer.
11 more elements
Dependencies are inferred from the claim text.