Magnetoresistive element with oxide magnetic layers and metal magnetic films deposited thereon
First Claim
1. A magnetoresistive element having a multi-layered composition of a ferromagnetic layer/a non-magnetic intermediate layer/a ferromagnetic layer, which are separated through the non-magnetic intermediate layer and has at least two ferromagnetic layers, and including elements, which allows the multi-layered composition to induce magnetoresistance when a relative magnetization angle defined between the ferromagnetic layers varies depending on an external magnetic field exerted, and at least one pair of electrodes for detecting the change in said magnetoresistance, wherein:
- at least one of said ferromagnetic layers is comprised of a high-polarized layer; and
at least one of the non-magnetic intermediate layer-ferromagnetic layer interface has a composition of a non-magnetic intermediate layer/a high-polarized layer/a ferromagnetic metal layer, said high-polarized layer being a ferromagnetic compound such as half-metal or a mixture of any of ferromagnetic compounds and metal.
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Accused Products
Abstract
No related magnetoresistive multi-layered films made from a metal magnetic film provide sufficient reproducing output power. A high-polarized layer with a thickness of 10 nm or less is formed as a Fe-rich Fe—O layer in contact with the interface of a non-magnetic intermediate layer and the resulting layers are heat treated to form a multi-layered film of ferromagnetic Fe—O layers, achieving a magnetoresistive element having high magnetoresistance.
27 Citations
12 Claims
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1. A magnetoresistive element having a multi-layered composition of a ferromagnetic layer/a non-magnetic intermediate layer/a ferromagnetic layer, which are separated through the non-magnetic intermediate layer and has at least two ferromagnetic layers, and including elements, which allows the multi-layered composition to induce magnetoresistance when a relative magnetization angle defined between the ferromagnetic layers varies depending on an external magnetic field exerted, and at least one pair of electrodes for detecting the change in said magnetoresistance, wherein:
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at least one of said ferromagnetic layers is comprised of a high-polarized layer; and
at least one of the non-magnetic intermediate layer-ferromagnetic layer interface has a composition of a non-magnetic intermediate layer/a high-polarized layer/a ferromagnetic metal layer, said high-polarized layer being a ferromagnetic compound such as half-metal or a mixture of any of ferromagnetic compounds and metal. - View Dependent Claims (2, 3, 4, 7, 8, 9, 10, 11, 12)
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5. A magnetoresistive element having the multi-layered composition of a first ferromagnetic metal layer/a non-magnetic intermediate layer/a second ferromagnetic layer/a antiparallel coupling layer/a third ferromagnetic metal layer/a antiferromagnetic film, and including the elements, which allows the said multi-layered composition to induce magnetoresistance when a relative magnetization angle defined between said first ferromagnetic layers varies depending on an external magnetic field exerted, and at least one pair of electrodes for detecting the change in said magnetoresistance, wherein:
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the magnetization of said third ferromagnetic layer is fixed substantially to the magnetic field to be sensed by means of said antiferromagnetic film and exchange coupling deposited on its whole surface by means of an exchange coupling force applied by said antiferromagnetic film, by which the magnetization of said second ferromagnetic layer is fixed substantially antiparallel to the magnetization orientation of said third ferromagnetic layer by means of the exchange coupling force applied by said antiparallel coupling layer, further by which the magnetization of said second ferromagnetic metal layer is fixed substantially to the magnetic field to be sensed, and said second ferromagnetic layer is composed of the multi-layered construction of the high-polarized layer, which is a mixture of the ferromagnetic oxide or the ferromagnetic oxide with a high-polarization and the ferromagnetic metal, and of the ferromagnetic metal layer;
said magnetoresistive element having the composition of the first ferromagnetic layer/the non-magnetic intermediate layer/the high-polarized layer/the ferromagnetic metal layer. - View Dependent Claims (6)
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Specification