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US 8,525,602 B2Granted
Magnetic device with weakly exchange coupled antiferromagnetic layer
AssigneeHoneywell International Inc.
InventorRomney R. Katti
Life of this patent
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Abstract
A magnetic device is provided in one example that comprises a free layer having a magnetic anisotropy. The magnetic anisotropy is at least partially non-uniform. The magnetic device further comprises an antiferromagnetic layer adjacent to and weakly exchange coupled with the free layer, wherein the weak exchange coupling reduces the non-uniformity of the magnetic anisotropy of the free layer.
Claims20
A system comprising:
- a spin torque oscillator comprising a magnetic device, the magnetic device comprising:
- a stack comprising a plurality of layers including a free layer having a magnetic anisotropy, wherein the magnetic anisotropy is at least partially non-uniform;
- and
- an antiferromagnetic layer formed at least partially around an outer perimeter of the stack and adjacent to the free layer and at least one other layer of the plurality of layers of the stack, wherein the antiferromagnetic layer is weakly exchange coupled with the free layer, and wherein the weak exchange coupling of the antiferromagnetic layer reduces the non-uniformity of the magnetic anisotropy of the free layer.
1 more element
A method for manufacturing a magnetic device of a spin torque oscillator, the method comprising:
- forming a stack comprising a plurality of layers including a free layer having at least a partially non-uniform magnetic anisotropy;
- and
- forming an antiferromagnetic layer at least partially around an outer perimeter of the stack and adjacent to the free layer and at least one other layer of the plurality of layers of the stack, wherein the antiferromagnetic layer reduces the non-uniformity of the magnetic anisotropy.
A system comprising:
- a circuit;
- a spin torque oscillator coupled to the circuit, the spin torque oscillator comprising:
- a stack comprising a plurality of layers including a free layer having at least a partially non-uniform magnetic anisotropy;
- and
- an antiferromagnetic layer formed at least partially around an outer perimeter of the stack and adjacent to the free layer and at least one other layer of the plurality of layers of the stack, wherein the antiferromagnetic layer is weakly exchange coupled to the free layer, wherein the weak exchange coupling causes the antiferromagnetic layer to reduce the non-uniformity of the magnetic anisotropy;
- wherein a current induces a magnetic field in the free layer, and wherein the spin torque oscillator provides a signal to the circuit, wherein the signal is related to the magnetic field.
3 more elements
Dependencies are inferred from the claim text.