Exchange coupling film, magneto-resistance effect device, magnetic head, and magnetic random access memory
First Claim
1. An exchange coupling film comprising:
- an antiferromagnetic layer formed of a disordered alloy, an exchange coupling giving layer formed of a ferromagnetic material selected from the group consisting of Co and CoFe alloy having face-centered cubic structure, being in contact with said antiferromagnetic layer, and giving exchange coupling at an interface between said antiferromagnetic layer and said exchange coupling giving layer, and an exchange coupling enhancement layer formed of a ferromagnetic material selected from the group consisting of Fe and CoFe alloy having body-centered cubic structure and provided on said exchange coupling giving layer so that said exchange coupling giving layer is sandwiched between said antiferromagnetic layer and said exchange coupling enhancement layer, said exchange coupling enhancement layer amplifying said exchange coupling by said exchange coupling giving layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A foundation layer increasing adhesive properties to a substrate, another foundation layer controlling orientation of an antiferromagnetic layer, the antiferromagnetic layer including a disordered alloy of IrMn, a pinning layer, and a cap protection layer are formed in the order on the substrate. The pinning layer includes two layers having an exchange coupling giving layer which exchange-couples to the antiferromagnetic layer and an exchange coupling enhancement layer which enhances the exchange coupling, the exchange coupling giving layer is made of a ferromagnetic material including Co or a Co100-XFeX alloy (O≦X<25) having face-centered cubic structure. The exchange coupling enhancement layer is made of Fe or a Co100-YFeY alloy (25≦Y≦100) having body-centered cubic structure.
-
Citations
14 Claims
-
1. An exchange coupling film comprising:
-
an antiferromagnetic layer formed of a disordered alloy, an exchange coupling giving layer formed of a ferromagnetic material selected from the group consisting of Co and CoFe alloy having face-centered cubic structure, being in contact with said antiferromagnetic layer, and giving exchange coupling at an interface between said antiferromagnetic layer and said exchange coupling giving layer, and an exchange coupling enhancement layer formed of a ferromagnetic material selected from the group consisting of Fe and CoFe alloy having body-centered cubic structure and provided on said exchange coupling giving layer so that said exchange coupling giving layer is sandwiched between said antiferromagnetic layer and said exchange coupling enhancement layer, said exchange coupling enhancement layer amplifying said exchange coupling by said exchange coupling giving layer. - View Dependent Claims (2)
-
-
3. An exchange coupling film comprising:
-
an antiferromagnetic layer formed of a disordered alloy, an exchange coupling giving layer formed of an amorphous ferromagnetic material made of CoFe, being in contact with said antiferromagnetic layer, and giving exchange coupling at an interface between said antiferromagnetic layer and said exchange coupling giving layer, and an exchange coupling enhancement layer formed of a ferromagnetic material selected from the group consisting of Fe and CoFe alloy having body-centered cubic structure and provided on said exchange coupling giving layer so that said exchange coupling giving layer is sandwiched between said antiferromagnetic layer and said exchange coupling enhancement layer, said exchange coupling enhancement layer amplifying said exchange coupling by said exchange coupling giving layer. - View Dependent Claims (4)
-
-
5. A magneto-resistance effect device comprising:
-
a magnetization fixing layer in which a direction of magnetic moment is fixed, said magnetization fixing layer comprising;
an antiferromagnetic layer formed of a disordered alloy, an exchange coupling giving layer formed of a ferromagnetic material selected from the group consisting of Co and CoFe alloy having face-centered cubic structure, being in contact with said antiferromagnetic layer, and giving exchange coupling at an interface between said antiferromagnetic layer and said exchange coupling giving layer, and an exchange coupling enhancement layer formed of a ferromagnetic material selected from the group consisting of Fe and CoFe alloy having body-centered cubic structure and provided on said exchange coupling giving layer so that said exchange coupling giving layer is sandwiched between said antiferromagnetic layer and said exchange coupling enhancement layer, said exchange coupling enhancement layer amplifying said exchange coupling by said exchange coupling giving layer, a free layer in which the direction of the magnetic moment is rotated by an external magnetic field, and a nonmagnetic layer provided between said magnetization fixing layer and said free layer. - View Dependent Claims (6, 9, 10, 11, 13)
-
-
7. A magneto-resistance effect device comprising:
-
a magnetization fixing layer in which a direction of magnetic moment is fixed, said magnetization fixing layer comprising;
an antiferromagnetic layer formed of a disordered alloy, an exchange coupling giving layer formed of an amorphous ferromagnetic material made of CoFe, being in contact with said antiferromagnetic layer, and giving exchange coupling at an interface between said antiferromagnetic layer and said exchange coupling giving layer, and an exchange coupling enhancement layer formed of a ferromagnetic material selected from the group consisting of Fe and CoFe alloy having body-centered cubic structure and provided on said exchange coupling giving layer so that said exchange coupling giving layer is sandwiched between said antiferromagnetic layer and said exchange coupling enhancement layer, said exchange coupling enhancement layer amplifying said exchange coupling by said exchange coupling giving layer. a free layer in which the direction of the magnetic moment is rotated by an external magnetic field, and a nonmagnetic layer provided between said magnetization fixing layer and said free layer. - View Dependent Claims (8, 12, 14)
-
Specification