Magnetic recording media design with reduced lattice mismatch between adjacent intermediate layers
AssigneeWestern Digital Technologies, Inc.
InventorKai Tang
Life of this patent
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Abstract
Magnetic recording media including an interlayer configured to reduce lattice mismatch with adjacent layers of the media, such as an adjacent seed layer or an adjacent underlayer. In one example, an interlayer alloy is provided that includes tungsten (W) along with Cobalt (Co), Chromium (Cr), and Ruthenium (Ru). The atomic percentages of W and Ru within the interlayer are selected so that the amount lattice mismatch between the interlayer and its adjacent layers is below a preselected amount, such as below 3% as quantified by d-spacing. In some examples, the atomic percentage of Ru is greater than 25% and the atomic percentage of W is 2-10%. Methods of fabricating the magnetic recording media are also provided.
Claims24
A magnetic recording medium, comprising:
- a substrate;
- a seed layer on the substrate;
- an interlayer on the seed layer, wherein the interlayer includes cobalt (Co), chromium (Cr), ruthenium (Ru) and an additional metal selected from a group consisting of tungsten (W), tantalum (Ta), molybdenum (Mo), and Niobium (Nb), and wherein the atomic percentage of the Ru within the interlayer is at least 25%;
- an underlayer directly on the interlayer;
- and
- one or more magnetic recording layers on the underlayer, wherein the one or more magnetic recording layers comprises perpendicular magnetic anisotropy.
A method for fabricating magnetic recording media, comprising:
- providing a substrate;
- providing a soft underlayer (SUL) on the substrate;
- providing a seed layer on the SUL;
- providing an interlayer on the seed layer, wherein the interlayer includes cobalt (Co), chromium (Cr), ruthenium (Ru) and an additional metal selected from a group consisting of tungsten (W), tantalum (Ta), molybdenum (Mo), and Niobium (Nb), and wherein the atomic percentage of the Ru within the interlayer is at least 25%;
- providing an underlayer directly on the interlayer;
- and
- providing one or more magnetic recording layers on the underlayer, wherein the one or more magnetic recording layers comprises perpendicular magnetic anisotropy.
A magnetic recording medium, comprising:
- a seed layer;
- an interlayer on the seed layer;
- an underlayer directly on the interlayer;
- and
- one or more magnetic recording layers on the underlayer, wherein the one or more magnetic recording layers comprises perpendicular magnetic anisotropy;
- wherein the interlayer comprises cobalt (Co), chromium (Cr), ruthenium (Ru) and an additional metal selected from a group consisting of tungsten (W), tantalum (Ta), molybdenum (Mo), and Niobium (Nb), and wherein the atomic percentage of the Ru within the interlayer is at least 25%.
A magnetic recording medium, comprising:
- a substrate;
- a seed layer on the substrate;
- an interlayer on the seed layer, wherein the interlayer includes cobalt (Co), chromium (Cr), ruthenium (Ru) and an additional metal selected from a group consisting of tungsten (W), tantalum (Ta), molybdenum (Mo), and Niobium (Nb), and wherein the atomic percentage of the Ru within the interlayer is at least 25%;
- an underlayer on the interlayer, wherein a lattice mismatch between the interlayer and one or both of the seed layer and the underlayer is no greater than 3%;
- and
- one or more magnetic recording layers on the underlayer, wherein the one or more magnetic recording layers comprises perpendicular magnetic anisotropy.
A magnetic recording medium, comprising:
- a seed layer;
- an interlayer on the seed layer;
- an underlayer on the interlayer;
- and
- one or more magnetic recording layers on the underlayer, wherein the one or more magnetic recording layers comprises perpendicular magnetic anisotropy;
- wherein the interlayer comprises cobalt (Co), chromium (Cr), ruthenium (Ru) and an additional metal selected from a group consisting of tungsten (W), tantalum (Ta), molybdenum (Mo), and Niobium (Nb), wherein the atomic percentage of the Ru within the interlayer is at least 25%, wherein a lattice mismatch between the interlayer and one or both of the seed layer and the underlayer is no greater than 3%.
Dependencies are inferred from the claim text.