Implanted Capping Layers for Magnetic Recording Media
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Solution Overview
Problem
Heat-assisted magnetic recording (HAMR) media exhibits higher roughness and DC noise compared to conventional perpendicular magnetic recording (CPMR) media, leading to poorer recording performance, and the deposition of capping layers in HAMR media is challenging due to issues like grain coarsening and difficulty in achieving desired thermo-magnetic properties.
Innovation Solution
The formation of implanted capping layers in magnetic media using either direct or indirect ion implantation techniques, where a capping material is introduced into the top surface of the magnetic recording layer, allowing for improved structural and magnetic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HAMR media is used to achieve higher recording densities, then recording density is improved, but media roughness increases leading to poorer recording performance
Solution Approach 1:
The patent changes the physical state and distribution parameters of the capping layer by using ion implantation to create a concentration gradient of capping material atoms within the magnetic recording layer. This allows the capping layer to form in-situ with controlled distribution, reducing surface roughness while maintaining the high recording density capability of HAMR media.
Solution Approach 2:
The patent replaces the conventional mechanical deposition process with ion implantation, which uses ion beams to inject capping material atoms directly into the magnetic recording layer. This substitution eliminates the surface roughness issues associated with traditional deposition methods while achieving the desired capping layer structure for high-density recording.
2Manufacturing precision
If a capping layer is deposited in HAMR media to reduce roughness, then media roughness is improved, but the deposition process causes grain coarsening and worsens overall performance
Solution Approach 1:
The patent performs preliminary action by implanting the capping material into the magnetic recording layer before final media formation. This pre-positioning of capping material atoms allows subsequent processing to proceed without causing grain coarsening, as the capping layer is already in place to protect the magnetic layer structure during heat treatment and other processing steps.
Solution Approach 2:
The patent replaces thermal deposition with ion implantation, which does not rely on high-temperature processes that cause grain coarsening. The ion implantation method introduces capping material at lower temperatures and with precise spatial control, preserving the fine grain structure necessary for reliable HAMR media performance.
3Ease of manufacture
If conventional deposition methods are used to form capping layers, then capping layer formation is achieved, but the process results in rougher media and difficulty achieving desired thermo-magnetic properties
Solution Approach 1:
The patent replaces conventional vapor deposition or sputtering methods with ion implantation. This substitution enables capping layer formation without the surface roughness problems inherent in mechanical deposition, while also providing precise control over the depth and concentration profile of the capping material to achieve desired thermo-magnetic properties.
Solution Approach 2:
The patent changes the formation process parameters by using ion implantation energy and dose control to precisely regulate capping material distribution. This allows optimization of both the capping layer formation ease and the resulting media surface quality, achieving smooth surfaces with controlled thermo-magnetic properties.
4Manufacturing precision
If ion implantation is used to form implanted capping layers, then media roughness is reduced and recording performance is enhanced, but the process complexity increases
Solution Approach 1:
The patent segments the capping layer formation process into controlled ion implantation steps with specific energy and dose parameters. This segmentation allows precise control over the capping material distribution profile, achieving reduced roughness and enhanced performance while managing process complexity through systematic parameter optimization.
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
The implanted capping layers reduce media roughness and enhance recording performance by providing better control over grain structure and thermo-magnetic properties, addressing the challenges faced by HAMR media while being applicable to various magnetic recording technologies like HAMR, PMR, and MAMR.
Implementation Method 1
implanting a capping material in the top surface of the magnetic recording layer
Data Source
AI summary
Systems and methods for forming implanted capping layers in magnetic media for magnetic recording are provided. One such method includes providing an underlayer, providing a magnetic recording layer on the underlayer, the magnetic recording layer including a bottom surface and a top surface where the bottom surface is between the top surface and the underlayer, and implanting a capping material in the top surface of the magnetic recording layer using a direct implantation technique or an indirect implantation technique.