Spin-current switched magnetic memory element suitable for circuit integration and method of fabricating the memory element
First Claim
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1. A spin-current switched magnetic memory element, comprising:
- a plurality of magnetic layers, comprising;
a fixed magnetic layer having a fixed magnetic moment; and
a free magnetic layer having a magnetic moment which is switchable by a spin-current; and
a barrier layer formed between said fixed and free magnetic layers,wherein said plurality of magnetic layers includes a perpendicular magnetic anisotropy component, Hp, with a magnitude sufficient to at least substantially offset an easy-plane demagnetization effect 4π
Ms, where Ms is a saturation magnetization, such that said perpendicular magnetic anisotropy component, Hp, reduces an amount of spin current needed to rotate said magnetic moment of said free magnetic layer out of the film plane, andwherein said perpendicular magnetic anisotropy component, Hp, comprises one of;
an interface-induced perpendicular magnetic anisotropy component which originated at an interface within a multilayer structure in the free magnetic layer;
a strain-induced perpendicular magnetic anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer; and
a crystalline anisotropy-induced perpendicular anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer.
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Abstract
A magnetic memory element switchable by current injection includes a plurality of magnetic layers, at least one of the plurality of magnetic layers having a perpendicular magnetic anisotropy component and including a current-switchable magnetic moment, and at least one barrier layer formed adjacent to the plurality of magnetic layers (e.g., between two of the magnetic layers). The memory element has the switching threshold current and device impedance suitable for integration with complementary metal oxide semiconductor (CMOS) integrated circuits.
72 Citations
38 Claims
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1. A spin-current switched magnetic memory element, comprising:
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a plurality of magnetic layers, comprising; a fixed magnetic layer having a fixed magnetic moment; and a free magnetic layer having a magnetic moment which is switchable by a spin-current; and a barrier layer formed between said fixed and free magnetic layers, wherein said plurality of magnetic layers includes a perpendicular magnetic anisotropy component, Hp, with a magnitude sufficient to at least substantially offset an easy-plane demagnetization effect 4π
Ms, where Ms is a saturation magnetization, such that said perpendicular magnetic anisotropy component, Hp, reduces an amount of spin current needed to rotate said magnetic moment of said free magnetic layer out of the film plane, andwherein said perpendicular magnetic anisotropy component, Hp, comprises one of; an interface-induced perpendicular magnetic anisotropy component which originated at an interface within a multilayer structure in the free magnetic layer; a strain-induced perpendicular magnetic anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer; and a crystalline anisotropy-induced perpendicular anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 36, 37, 38)
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33. A spin-current switched magnetic memory element, comprising:
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a plurality of magnetic layers comprising a first magnetic layer comprising a fixed magnetic moment; and a second magnetic layer comprising a magnetic moment which is switchable by a spin-current; and a barrier layer formed between said first and second magnetic layers, wherein said plurality of magnetic layers includes a perpendicular magnetic anisotropy component, Hp, with a magnitude sufficient to at least substantially offset an easy-plane demagnetization effect 4π
Ms, where Ms is a saturation magnetization, such that said perpendicular magnetic anisotropy component, Hp, reduces an amount of spin current needed to rotate said magnetic moment of said free magnetic layer out of the film plane, andwherein said perpendicular magnetic anisotropy component, Hp, comprises one of; an interface-induced perpendicular magnetic anisotropy component which originated at an interface within a multilayer structure in the free magnetic layer; a strain-induced perpendicular magnetic anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer; and a crystalline anisotropy-induced perpendicular anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer.
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35. A spin-current switched magnetic memory element, comprising:
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a pair of leads; and a plurality of magnetic layers formed between said pair of leads, said plurality of magnetic layers comprising; a fixed magnetic layer having a fixed magnetic moment; and a free magnetic layer having a magnetic moment which is switchable by a spin-current; and a barrier layer formed between said fixed and free magnetic layers, wherein said plurality of magnetic layers includes a perpendicular magnetic anisotropy component, Hp, with a magnitude sufficient to at least substantially offset an easy-plane demagnetization effect 4π
Ms, where Ms is a saturation magnetization, such that said perpendicular magnetic anisotropy component, Hp, reduces an amount of spin current needed to rotate said magnetic moment of said free magnetic layer out of the film plane,wherein at least one of said fixed and free magnetic layers is formed in a cylinder-shaped pillar disposed between said pair of leads, wherein said memory element comprises one of a spin-valve device and a magnetic tunnel junction-based spin injection switch, wherein said a perpendicular magnetic anisotropy component comprises one of interface-induced perpendicular magnetic anisotropy component and strain-induced perpendicular magnetic anisotropy component, and wherein said perpendicular magnetic anisotropy component comprises a component of magnetic anisotropy which is perpendicular to a film plane in said plurality of magnetic layers, and wherein said perpendicular magnetic anisotropy component, Hp, comprises one of; an interface-induced perpendicular magnetic anisotropy component which originated at an interface within a multilayer structure in the free magnetic layer; a strain-induced perpendicular magnetic anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer; and a crystalline anisotropy-induced perpendicular anisotropy component which originated within at least one of the fixed magnetic layer and free magnetic layer.
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Specification