Crosslinked Polymer Data Storage Medium Wear Resistance
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Solution Overview
Problem
Current data storage technologies face challenges in achieving high crosslink density for media wear resistance while maintaining low glass transition temperatures for soft writing conditions, especially at fast writing speeds, which requires a trade-off between heat and force that is not feasible for high-speed operations.
Innovation Solution
A method involving the deposition and curing of a crosslinking agent with at least three alkyne groups on a substrate to form a crosslinked polymeric layer, creating a bilayered material with a thin, hard crust on a soft underlayer, which enhances crosslink density and reduces tip wear without dewetting issues, allowing for efficient data storage in the nanometer regime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinking density is increased to improve media wear resistance, then tip wear increases due to higher forces required for indentation
Solution Approach 1:
The patent applies a crosslinking agent only to the surface region of the polymer layer, creating a localized crosslinked zone with enhanced wear resistance. The bulk polymer layer maintains its original properties including lower glass transition temperature. This spatial differentiation allows the surface to resist tip wear while the underlying soft layer facilitates easy indentation at high speeds.
Solution Approach 2:
The storage medium becomes a composite structure combining a crosslinked polymeric surface layer with a non-crosslinked or less crosslinked bulk polymer layer. This composite architecture integrates the advantages of both materials: the crosslinked surface provides wear resistance and dimensional stability, while the soft bulk layer enables low-force writing operations even at high velocities.
2Object-generated harmful factors
If writing temperature is increased to reduce forces and tip wear, then the trade-off becomes impossible for fast writing at maximum heater temperature
Solution Approach 1:
The patent modifies the material parameters of the storage medium by introducing crosslinked sections with altered thermal and mechanical properties. The crosslinked regions maintain structural integrity at higher temperatures, allowing the system to operate at elevated temperatures suitable for high-speed writing without excessive tip wear, as the crosslinked network prevents material degradation.
Solution Approach 2:
The crosslinking agent is deposited and cured in advance to create a pre-conditioned surface layer before high-speed writing operations begin. This preliminary modification of the surface properties ensures that subsequent high-temperature, high-speed writing operations can proceed without the harmful effects of tip wear that would occur on uncrosslinked surfaces.
3Ease of operation
If polymer glass transition temperature is minimized for soft writing conditions, then thermal stability decreases
Solution Approach 1:
The patent segments the polymer layer into distinct functional zones: a crosslinked surface layer providing thermal stability and dimensional control, and a non-crosslinked bulk layer providing softness for easy indentation. This segmentation allows each zone to optimize its properties independently, resolving the contradiction between thermal stability and writing softness.
Solution Approach 2:
Different thermal and mechanical properties are assigned to different regions of the polymer layer. The surface region contains crosslinked sections with high thermal stability, while the bulk material maintains low glass transition temperature for soft writing. This local differentiation of material properties simultaneously satisfies both requirements.
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 a data storage medium with improved wear resistance and thermal stability, allowing for high-speed writing and reading operations without significant tip wear, while maintaining the necessary softness for efficient data storage in the nanometer regime.
Implementation Method 1
deposition of a crosslinking agent on a surface of a substrate, said crosslinking agent containing at least three alkyne groups (i.e. containing at least three carbon-carbon triple bonds); curing the deposited crosslinking agent, thereby producing a modified surface of the substrate, so as to obtain the data storage medium in the form of a crosslinked polymeric layer
Implementation Method 2
Heating of the tip is achieved via a heater dedicated to the writing/formation of the indentation marks. The polymer layer softens locally where it is contacted by the heated tip.
Implementation Method 3
The thermal sensing is based on the fact that the thermal conductance between the probe and the storage medium changes when the probe is moving in an indentation as the heat transport is in this case more efficient. As a consequence of this, the temperature of the heater decreases and hence, also its electrical resistance changes.
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
The present invention is directed to a method for producing a data storage medium on a surface of a substrate for storing data in the form of topographic features. The method comprises a first step wherein a crosslinking agent containing at least three alkyne groups is deposited on the surface of the substrate. In a second step the deposited cross linking agent is cured so as to obtain the data storage medium in the form of a crosslinked polymeric layer on the surface of the substrate. The invention is further directed to a data storage medium obtained by this method and a data storage device comprising this data storage medium