Patterned Magnetic Recording Medium with FePtRh Alloy
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Solution Overview
Problem
Conventional magnetic recording mediums face challenges in increasing track and bit density due to indistinct boundary lines between tracks, surface property deterioration, and high production costs, particularly with etching methods, and magnetic energy loss due to thermal fluctuations in ion implantation methods.
Innovation Solution
A patterned medium is developed using a magnetic recording layer with alternating ferromagnetic and antiferromagnetic regions, where the ferromagnetic regions are formed of an FePtRh alloy with controlled composition through ion implantation or atomic diffusion, allowing for sharp transitions between ferromagnetism and antiferromagnetism, enhancing magnetic separation and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If etching methods are used to form tracks, then track separation is achieved, but boundary lines become indistinct and surface properties deteriorate
Solution Approach 1:
The invention changes the physical-chemical parameters of the magnetic recording layer by controlling the concentration of nonmagnetic atoms (such as Ru, Rh, Ir, Pd, Os, Ag, In, Sn, Tl, Pb, Bi, or their combinations) within specific ranges (e.g., Ru concentration of 0.1-5 at%). This compositional parameter control enables sharp magnetic property changes without physical etching, thus achieving distinct track boundaries while preserving surface properties.
Solution Approach 2:
The invention replaces the mechanical etching process with a compositional modulation approach. Instead of physically removing material to create track separation, the method uses controlled variation in nonmagnetic atom concentration to create regions with different magnetic properties, thereby achieving track formation without mechanical damage to the surface.
2Manufacturing precision
If ion implantation is used to weaken magnetism in tracks, then magnetic separation is achieved, but magnetic energy is lost due to thermal fluctuations
Solution Approach 1:
The invention uses parameter changes in compositional concentration rather than extreme ion implantation. By controlling nonmagnetic atom concentration within optimal ranges, the magnetic properties are sufficiently modified for track separation while avoiding the excessive magnetic energy loss and thermal instability caused by heavy ion implantation.
Solution Approach 2:
The invention applies local quality control by creating spatially varying concentrations of nonmagnetic atoms. The magnetic recording layer has different compositions in different regions: higher nonmagnetic atom concentration in track separation regions and lower concentration in data recording regions. This local compositional differentiation achieves magnetic separation while preserving magnetic energy in the data regions.
3Quantity of substance
If track density is increased, then recording capacity is improved, but thermal stability decreases
Solution Approach 1:
The invention uses compositional parameter control to achieve high track density while maintaining thermal stability. By precisely controlling nonmagnetic atom concentration within specific ranges, the magnetic anisotropy and coercivity are optimized to provide thermal stability even at high densities.
Solution Approach 2:
The invention creates a composite magnetic recording layer with multiple elements (Fe, Pt, Rh, Ru, Ir, Pd, Os, Ag, In, Sn, Tl, Pb, Bi) in controlled proportions. This composite structure provides both the magnetic properties needed for high-density recording and the thermal stability required for reliable data storage, overcoming the trade-off between density and stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables increased recording density, improved surface properties, reduced production costs, and stable magnetic head floating, facilitating high-density magnetic recording while maintaining coercive force and magnetization necessary for effective data storage.
Implementation Method 1
ion implantation or atomic diffusion
Implementation Method 2
ion implantation or atomic diffusion
Implementation Method 3
ferromagnetic regions are formed of an FePtRh alloy with controlled composition
Implementation Method 4
alternating ferromagnetic and antiferromagnetic regions, where the ferromagnetic regions are formed of an FePtRh alloy
Data Source
AI summary
A magnetic recording medium for use in digital magnetic recording, which comprises a nonmagnetic substrate having deposited thereon a magnetic layer, wherein with respect to the in-plane direction, the magnetic recording layer comprises a plurality of ferromagnetic regions separated from each other by an antiferromagnetic region. A production method of the magnetic recording medium and a magnetic disc apparatus are also disclosed.