Magnetic device and solid-state magnetic memory
AssigneeCanon Kabushiki Kaisha
InventorTohru Den
Life of this patent
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Abstract
A magnetic device which has a layer having pores on a substrate and is to be used by applying electric current in the direction of depth of the pores includes a laminated structure in which a first ferromagnetic layer, a second ferromagnetic layer having a smaller coercive force than the first ferromagnetic layer and a non-magnetic layer are laminated within a part or all of the pores, wherein a hard layer having the first ferromagnetic layer, and a free ferromagnetic layer including the second ferromagnetic layer are laminated through the non-magnetic layer, and the hard layer further has a laminated structure in which a plurality of first ferromagnetic layers form antiferromagnetic coupling through the non-magnetic layer. A solid-state magnetic memory has the magnetic device.
Claims22
A magnetic device which has a layer having pores on a substrate and is to be used by applying electric current in the direction of depth of said pores, comprising:
- a laminated structure in which ferromagnetic layers and non-magnetic layers are laminated within a part or all of said pores;
- wherein in said laminated structure a hard layer and a free ferromagnetic layer are laminated with a non-magnetic layer between said hard layer and said free ferromagnetic layer;
- and
- wherein said hard layer has a laminated structure in which a plurality of ferromagnetic layers form antiferromagnetic coupling through at least one part of said non-magnetic layers.
A CPP type magnetic device comprising:
- a region having a pore;
- a hard layer within the pore;
- a free ferromagnetic layer within the pore;
- and
- a non-magnetic layer between said hard layer and said free ferromagnetic layer,
- wherein said hard layer has a laminated structure comprising a first ferromagnetic portion, a second ferromagnetic portion, and a non-magnetic portion between said first and second ferromagnetic portions, and
- wherein said second ferromagnetic portion antiferromagnetically couples with said first ferromagnetic portion.
A magnetic device comprising:
- a region having a pore;
- a hard layer within the pore;
- a free ferromagnetic layer within the pore;
- and
- a non-magnetic layer between said hard layer and said free ferromagnetic layer,
- wherein said hard layer has a laminated structure comprising a first ferromagnetic portion, a second ferromagnetic portion, and a non-magnetic portion between said first and second ferromagnetic portions, and
- wherein said second ferromagnetic portion antiferromagnetically couples with said first ferromagnetic portion.
A magnetic device comprising:
- a hard layer having a first ferromagnetic portion;
- a free ferromagnetic layer having a second ferromagnetic portion;
- and
- a non-magnetic layer between said hard layer and said free ferromagnetic layer,
- wherein said hard layer, said free ferromagnetic layer, and said non-magnetic layer are formed inside pores of a region having pores.
Dependencies are inferred from the claim text.