Magnetic storage media having tilted magnetic anisotropy
AssigneeSeagate Technology LLC
InventorsKalman Pelhos, Timothy J. Klemmer, Michael A. Seigler
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Abstract
A magnetic storage media comprises a substrate supporting the layer of magnetic media having a tilted C-axis greater than approximately 25° with respect to surface normal and having a magnetic easy axis tilted at an angle at approximately greater than 30° from the substrate surface normal. The media includes an oblique deposited seedlayer structure directing tilted C-axis growth of the magnetic material layer independent of the angle of deposition of the magnetic material layer. The orientation C-axis and the magnetic easy axis of the media may be organized into circumferential or radial patterns on the substrate surface, and additionally may possess azimuthal symmetry.
Claims25
A magnetic storage medium comprising:
- a substrate having a substrate surface;
- a seedlayer structure overlying the substrate surface;
- a magnetic material layer on the seedlayer structure, the magnetic material layer having a C-axis tilted at about a first angle with respect to an axis perpendicular to the substrate surface and having a magnetic easy axis oriented at a second angle with respect to the axis perpendicular to the substrate surface;
- and
- a soft magnetic underlayer between the substrate and the seedlayer structure.
A magnetic storage medium comprising:
- a substrate having a substrate surface;
- a seedlayer structure overlying the substrate surface;
- and
- a magnetic material layer on the seedlayer structure, the magnetic material layer having a C-axis tilted at a first angle with respect to an axis perpendicular to the substrate surface and having a magnetic easy axis oriented at a second angle with respect to the axis perpendicular to the substrate surface;
- wherein the seedlayer structure comprises:
- a first seedlayer that defines a tilted grain structure;
- and
- a second seedlayer overlying the first seedlayer that creates a preferred crystallographic texture and provides a template for epitaxial growth of the magnetic material layer.
A rigid thin film magnetic storage medium for use in a data storage device having a surface normal, the thin film magnetic storage medium comprising:
- a substrate;
- a magnetic material layer;
- a seedlayer structure underlying the magnetic material layer;
- and
- a soft magnetic underlayer between the substrate and the seedlayer structure;
- wherein the magnetic material layer comprises:
- a C-axis;
- and
- a uniaxial magnetic easy axis tilted with respect to surface normal.
A rigid thin film magnetic storage medium for use in a data storage device having a surface normal, the thin film magnetic storage medium comprising:
- a substrate;
- a seedlayer structure overlying the substrate;
- and
- a magnetic material layer, the magnetic material layer comprising:
- a C-axis, wherein the C-axis is tilted between about 25° and about 55° with respect to surface normal;
- and
- a uniaxial magnetic easy axis tilted and the magnetic easy axis is tilted between about 30° and about 60° with respect to surface normal.
A rigid thin film magnetic storage medium for use in a data storage device having a surface normal, the thin film magnetic storage medium comprising:
- a substrate;
- a magnetic material layer;
- and
- a seedlayer structure underlying the magnetic material layer, the seedlayer structure comprising:
- a first seedlayer overlying the substrate that defines a tilted columnar structure;
- and
- a second seedlayer overlying the first seedlayer that defines a tilted crystalline structure and provides a template for expitaxial growth of the magnetic material layer;
- wherein the magnetic material layer comprises:
- a C-axis;
- and
- a uniaxial magnetic easy axis tilted with respect to surface normal.
A magnetic storage medium comprising:
- a substrate having a substrate surface;
- a seedlayer structure overlying the substrate surface, wherein the seedlayer structure includes crystallographic texture tilted with respect to an axis perpendicular to the substrate surface and acts as a template for epitaxial growth;
- and
- a magnetic material layer on the seedlayer structure, the magnetic material layer having a C-axis tilted at about a first angle with respect to an axis perpendicular to the substrate surface and having a magnetic easy axis oriented at a second angle with respect to the axis perpendicular to the substrate surface, wherein the magnetic material layer has a columnar structure oriented at bout 90° to the substrate surface.
Dependencies are inferred from the claim text.