Magnetic recording medium and magnetic recording device
AssigneeTDK Corporation
InventorsShuichi Okawa, Takahiro Suwa
Life of this patent
Estimating the term…
Abstract
The magnetic recording medium includes a seed layer and a magnetic recording layer formed on the seed layer. The magnetic recording layer is provided with a plurality of laminated layers and a noble metal layer. The laminated layer includes a transition metal element layer and a platinum group element layer. The noble metal layer is interposed between the laminated layers. The magnetic recording medium satisfies the relational expression 0<Y/X≦1.0, where X is the thickness of the seed layer, and Y is the sum total of the thickness of the noble metal layer in the magnetic recording layer.
Claims16
A magnetic recording medium, comprising:
- a seed layer containing at least one metal selected from the group consisting of Ag, Au, Pt, Pd, Ru, and Cu;
- and
- a magnetic recording layer formed on said seed layer, said magnetic recording layer having a plurality of laminated layers and a noble metal layer placed between said laminated layers,
- wherein said laminated layers each include a transition metal element layer containing at least one metal selected from the group consisting of Co, Ni, and Fe and a platinum group element layer containing at least one metal selected from the group consisting of Pt and Pd, said transition metal element layer and said platinum group element layer being in direct contact with one another;
- wherein said noble metal layer contains at least one metal selected from the group consisting of Ag, Au, Ru, and Cu;
- and
- wherein a relational expression 0<Y/X≦1.0 is satisfied, where X is thickness of said seed layer, and Y is a sum total of thickness of said noble metal layer in said magnetic recording layer.
A magnetic recording device, comprising:
- a magnetic recording medium, comprising:
- a seed layer containing at least one metal selected from the group consisting of Ag, Au, Pt, Pd, Ru, and Cu;
- and
- a magnetic recording layer formed on said seed layer, said magnetic recording layer having a plurality of laminated layers and a noble metal layer placed between said laminated layers,
- wherein said laminated layers each include a transition metal element layer containing at least one metal selected from the group consisting of Co, Ni, and Fe and a platinum group element layer containing at least one metal selected from the group consisting of Pt and Pd, said transition metal element layer and said platinum group element layer being in direct contact with one another;
- wherein said noble metal layer contains at least one metal selected from the group consisting of Ag, Au, Ru, and Cu;
- and
- wherein a relational expression 0<Y/X≦1.0 is satisfied, where X is thickness of said seed layer, and Y is a sum total of thickness of said noble metal layer in said magnetic recording layer;
- and
- a magnetic head for writing and reading data onto and from said magnetic recording medium.
Dependencies are inferred from the claim text.