Current-perpendicular-to-plane-type magnetoresistive device, and magnetic head and magnetic recording-reproducing apparatus using the same
First Claim
1. A magnetoresistive device, comprising:
- a magnetization pinned layer with a magnetization direction substantially pinned to one direction;
a magnetization free layer with a magnetization direction that changes in accordance with an external magnetic field;
a nonmagnetic intermediate layer formed between the magnetization pinned layer and the magnetization free layer; and
electrodes configured to allow a sense current to flow in a direction substantially perpendicular to a plane of a stack including the magnetization pinned layer, the nonmagnetic intermediate layer, and the magnetization free layer, wherein at least one of the magnetization pinned layer and the magnetization free layer comprising a ferromagnetic layer, the ferromagnetic layer being substantially formed of an alloy represented by formula (A) given below;
Fe100-aCoa
(A) where 20%≦
a≦
80%, and the alloy having a body-centered cubic crystal structure.
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Abstract
A magnetoresistive device includes a magnetization pinned layer, a magnetization free layer, a nonmagnetic intermediate layer formed between the magnetization pinned layer and the magnetization free layer, and electrodes allowing a sense current to flow in a direction substantially perpendicular to the plane of the stack including the magnetization pinned layer, the nonmagnetic intermediate layer and the magnetization free layer. At least one of the magnetization pinned layer and the magnetization free layer is substantially formed of a binary or ternary alloy represented by the formula FeaCobNic (where a+b+c=100 at %, and a≦75 at %, b≦75 at %, and c≦63 at %), or formed of an alloy having a body-centered cubic crystal structure.
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Citations
18 Claims
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1. A magnetoresistive device, comprising:
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a magnetization pinned layer with a magnetization direction substantially pinned to one direction;
a magnetization free layer with a magnetization direction that changes in accordance with an external magnetic field;
a nonmagnetic intermediate layer formed between the magnetization pinned layer and the magnetization free layer; and
electrodes configured to allow a sense current to flow in a direction substantially perpendicular to a plane of a stack including the magnetization pinned layer, the nonmagnetic intermediate layer, and the magnetization free layer, wherein at least one of the magnetization pinned layer and the magnetization free layer comprising a ferromagnetic layer, the ferromagnetic layer being substantially formed of an alloy represented by formula (A) given below;
Fe100-aCoa
(A)where 20%≦
a≦
80%, andthe alloy having a body-centered cubic crystal structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A magnetoresistive device, comprising:
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a magnetization pinned layer with a magnetization direction substantially pinned to one direction;
a magnetization free layer with a magnetization direction that changes in accordance with an external magnetic field;
a nonmagnetic intermediate layer formed between the magnetization pinned layer and the magnetization free layer; and
electrodes configured to allow a sense current to flow in a direction substantially perpendicular to a plane of a stack including the magnetization pinned layer, the nonmagnetic intermediate layer, and the magnetization free layer, wherein at least one of the magnetization pinned layer and the magnetization free layer comprises a ferromagnetic layer, the ferromagnetic layer being substantially formed of an alloy represented by formula (B) given below;
(Fe(100-a)/100Coa/100)100-xMx
(B)where 20%≦
a≦
80%, 0.1%≦
x≦
20%, and M is at least one element selected from the group consisting of Mn, Cu, Re, Ru, Pd, Pt, Ag, Au and Al, andthe alloy having a body-centered cubic crystal structure. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification