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US 2026/0104478 A1Published application
Tmr sensor having antiferromagnetically coupled vortices
AssigneeAllegro MicroSystems, LLC
InventorsPaolo Campiglio, Noémie Belin, Samridh Jaiswal, Maxime Rioult
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Abstract
Methods and apparatus for a sensor having a TMR stack with first and second vortices that are antiferromagnetically coupled together in a synthetic anti-ferromagnet (SAF) arrangement to create a TMR free layer. Due to the opposite behavior of the vortices, and to the coupling which opposes them, relatively strong fields are needed to induce magnetic modifications in the free layer. With this arrangement, the free layer of the stack has relatively wide linear response.
Claims22
A device, comprising:
- a TMR element comprising a free layer, a spacer layer, and a reference layer, wherein the free layer comprises:
- a first ferromagnetic layer to support a first vortex having a first chirality;
- a second ferromagnetic layer to support a second vortex having a second chirality that is opposite the first chirality, wherein the first and second vortices are configured to be antiferromagnetically coupled;
- and
- a spacer between the first and second ferromagnetic layers.
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A method, comprising:
- forming a TMR element comprising a free layer, a spacer layer, and a reference layer,
- forming the free layer by:
- forming a first ferromagnetic layer to support a first vortex having a first chirality;
- forming a second ferromagnetic layer to support a second vortex having a second chirality that is opposite the first chirality, wherein the first and second vortices are configured to be antiferromagnetically coupled;
- and
- forming a spacer between the first and second ferromagnetic layers.
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Dependencies are inferred from the claim text.