Magnetoresistive magnetic field sensor structure
First Claim
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1. A magnetic field sensor structure comprising:
- a first magnetoresistive element in a spin-valve arrangement with a first reference layer structure with a first reference magnetization direction and with a first ferromagnetic layer structure antiferromagnetically coupled to the first reference layer structure, wherein a first layer thickness ratio DPL,1/DRL,1 of a thickness DPL,1 of the first ferromagnetic layer structure to a thickness DRL,1 of the first reference layer structure is greater than 1, the first magnetoresistive element further comprising a third ferromagnetic layer structure and a first barrier layer structure, wherein the first barrier layer structure is arranged between the third ferromagnetic layer structure and the first reference layer, and wherein the first barrier layer is formed to magnetically decouple or to weakly couple the third ferromagnetic layer structure and the first reference layer structure; and
a second magnetoresistive element in a spin-valve arrangement with a second reference layer structure with a second reference magnetization direction and with a second ferromagnetic layer structure antiferromagnetically coupled to the second reference layer structure, wherein a second layer thickness ratio DPL,2/DRL,2 of a thickness DPL,2 of the second ferromagnetic layer structure to a thickness DRL,2 of the second reference layer structure is smaller than 1, the second magnetoresistive element further comprising a fourth ferromagnetic layer structure and a second barrier layer structure, wherein the second barrier layer structure is arranged between the fourth ferromagnetic layer structure and the second reference layer structure, and wherein the second barrier layer structure is formed to magnetically decouple or to weakly couple the fourth ferromagnetic layer structure and the second reference layer structure,wherein the first and second magnetoresistive elements are arranged in a layer stack vertically above each other and galvanically isolated from each other by an intermediate layer, and wherein the first and second reference magnetization directions are different.
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Abstract
A magnetic field sensor structure including a first magnetoresistive element in a spin-valve arrangement with a first reference layer structure with a first reference magnetization direction and a second magnetoresistive element in a spin-valve arrangement with a second reference layer structure with a second reference magnetization direction, wherein the first and second magnetoresistive elements are arranged in a layer vertically above each other and galvanically isolated from each other by an intermediate layer, and wherein the first and second reference magnetization directions are different.
23 Citations
32 Claims
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1. A magnetic field sensor structure comprising:
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a first magnetoresistive element in a spin-valve arrangement with a first reference layer structure with a first reference magnetization direction and with a first ferromagnetic layer structure antiferromagnetically coupled to the first reference layer structure, wherein a first layer thickness ratio DPL,1/DRL,1 of a thickness DPL,1 of the first ferromagnetic layer structure to a thickness DRL,1 of the first reference layer structure is greater than 1, the first magnetoresistive element further comprising a third ferromagnetic layer structure and a first barrier layer structure, wherein the first barrier layer structure is arranged between the third ferromagnetic layer structure and the first reference layer, and wherein the first barrier layer is formed to magnetically decouple or to weakly couple the third ferromagnetic layer structure and the first reference layer structure; and a second magnetoresistive element in a spin-valve arrangement with a second reference layer structure with a second reference magnetization direction and with a second ferromagnetic layer structure antiferromagnetically coupled to the second reference layer structure, wherein a second layer thickness ratio DPL,2/DRL,2 of a thickness DPL,2 of the second ferromagnetic layer structure to a thickness DRL,2 of the second reference layer structure is smaller than 1, the second magnetoresistive element further comprising a fourth ferromagnetic layer structure and a second barrier layer structure, wherein the second barrier layer structure is arranged between the fourth ferromagnetic layer structure and the second reference layer structure, and wherein the second barrier layer structure is formed to magnetically decouple or to weakly couple the fourth ferromagnetic layer structure and the second reference layer structure, wherein the first and second magnetoresistive elements are arranged in a layer stack vertically above each other and galvanically isolated from each other by an intermediate layer, and wherein the first and second reference magnetization directions are different. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of producing a magnetic field sensor structure, the method comprising:
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arranging a first magnetoresistive element in a spin-valve arrangement with a first reference layer structure with a layer thickness DRL,1 and a first ferromagnetic layer structure with a layer thickness DPL,1, wherein the first ferromagnetic layer structure is antiferromagnetically coupled to the first reference layer structure, wherein arranging the first magnetoresistive element comprises forming a third ferromagnetic layer structure above or below the first reference layer structure with a barrier layer structure therebetween, wherein the barrier layer structure is formed to magnetically decouple or to weakly couple the third ferromagnetic layer structure and the first reference layer; arranging a second magnetoresistive element, vertically above the first magnetoresistive element and galvanically isolated therefrom, in a spin-valve arrangement with a second reference layer structure with a layer thickness DRL,2 and a second ferromagnetic layer structure with a layer thickness DPL,2, wherein the second ferromagnetic layer structure is antiferromagnetically coupled to the second reference layer structure, wherein arranging the second magnetoresistive element comprising forming a fourth ferromagnetic layer structure on or below the second reference layer structure with a second barrier layer structure therebetween, wherein the second barrier layer structure is formed to magnetically decouple or to weakly couple the fourth ferromagnetic layer structure and the second reference layer structure; wherein a first layer thickness ratio of the layer thickness DPL,1 to the layer thickness DRL,1 is greater than 1, and a layer thickness ratio of the layer thickness DPL,2 to the layer thickness DRL,2 is smaller than 1; and exposing the first magnetoresistive element and the second magnetoresistive element to a magnetization field with an advantageous magnetization direction during a magnetization write-in process in order to achieve different reference magnetization directions in the first and second reference layer structures due to the different layer thickness ratios. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A magnetic field sensor structure comprising:
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a first magnetoresistive element in a spin-valve arrangement with a first reference layer structure with a first reference magnetization direction and with a first ferromagnetic layer structure antiferromagnetically coupled to the first reference layer structure, wherein a first layer thickness ratio DPL,1/DRL,1 of a thickness DPL,1 of the first ferromagnetic layer structure to a thickness DRL,1 of the first reference layer structure is greater than 1, the first magnetoresistive element further comprising a third ferromagnetic layer structure; and a second magnetoresistive element in a spin-valve arrangement with a second reference layer structure with a second reference magnetization direction and with a second ferromagnetic layer structure antiferromagnetically coupled to the second reference layer structure, wherein a second layer thickness ratio DPL,2/DRL,2 of a thickness DPL,2 of the second ferromagnetic layer structure to a thickness DRL,2 of the second reference layer structure is smaller than 1, the second magnetoresistive element further comprising a fourth ferromagnetic layer structure, wherein the first and second magnetoresistive elements are arranged in a layer stack vertically above each other and galvanically isolated from each other by an intermediate layer, and wherein the first and second reference magnetization directions are different, wherein the third ferromagnetic layer structure has a large lateral geometrical aspect ratio resulting in a magnetization direction of the third ferromagnetic layer structure which is perpendicular or approximately perpendicular to the reference magnetization direction of the first reference layer structure, and wherein the fourth ferromagnetic layer structure has a large lateral geometrical aspect ratio resulting in a magnetization direction of the fourth ferromagnetic layer structure which is perpendicular or approximately perpendicular to the reference magnetization direction of the second reference layer structure. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification