Co/Pt-Pd Artificial Lattice Film for TEAR Media
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Solution Overview
Problem
Current thermal energy assisted magnetic recording media face challenges in maintaining high signal-to-noise ratio (SNR) while ensuring continuous anti-sliding reliability during low-flying head conditions, leading to potential device failure due to lubricating layer depletion.
Innovation Solution
A thermal energy assisted medium with an artificial lattice film comprising a first layer of Co and a second layer of Pt and Pd, where the Pd concentration is between 20-40 atomic %, is laminated repeatedly to form a recording layer, enhancing both SNR and anti-sliding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a medium using Co/Pd artificial lattice is used to achieve higher SNR, then signal-to-noise ratio is improved, but continuous anti-sliding reliability is degraded
Solution Approach 1:
The patent changes the chemical composition parameters of the artificial lattice film by introducing Pd atoms at specific concentrations (1-20 at%) in the Pt layer, thereby modifying both the magnetic properties (improving SNR) and the mechanical properties (maintaining anti-sliding reliability) of the recording medium
Solution Approach 2:
The patent creates a composite artificial lattice structure combining Co, Pt, and Pd elements in specific configurations (Co/Pt-Pd or Co/Pd-Pt layers), where the synergistic interaction between different materials achieves both high SNR and reliable anti-sliding performance that cannot be obtained with single-material systems
2Duration of action of moving object
If head is kept flying in limited specific radius continuously for long time, then reproduction output is maintained, but lubricating layer is depleted causing cap layer to break
Solution Approach 1:
The patent modifies the surface energy and friction characteristics of the recording medium by controlling Pd concentration and layer thickness, which reduces the adhesion force between head and medium, thereby preventing lubricating layer depletion during continuous flying operations
Solution Approach 2:
The patent optimizes the cap layer design with controlled thickness and material composition to provide a sacrificial protective layer that prevents direct contact and damage to underlying layers during extended low-flying operations
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 proposed medium achieves improved continuous anti-sliding reliability and high SNR, preventing device failure by optimizing the Pd concentration in the Pt-Pd alloy layers, which facilitates stable reproduction output over extended periods.
Implementation Method 1
the optimal film thicknesses of Pt and Pd at which the anisotropy magnetic field is at a maximum are about 0.2 nm and 0.6 nm, respectively, for multilayer films of Co/Pt and Co/Pd
Implementation Method 2
the anisotropy magnetic field is at a maximum
Implementation Method 3
a thin film resistor in which the tip of a magnetic pole is thermally expanded to project by turning on electricity to generate heat
Implementation Method 4
a magnetic head having a thin film magnetic head element is formed with a thin film resistor in which the tip of a magnetic pole is thermally expanded to project by turning on electricity to generate heat
Data Source
AI summary
In order to provide a thermal energy assisted medium capable of improving anti-sliding reliability over long periods of time in low flying head conditions, while also maintaining a high SNR, a unique medium is proposed. A soft magnetic layer is formed on a substrate, a soft magnetic layer is formed thereon via a non-magnetic intermediate layer, and an intermediate layer, a crystal oriented control intermediate layer, an artificial lattice intermediate layer having an artificial lattice film in which a first layer comprising Co and a second layer comprising Pt and Pd are laminated repeatedly to form a recording layer, and a cap layer and an lubricating layer are formed. The concentration of Pd comprising the second layer is from about 20 atomic % to about 40 atomic %. Other mediums and systems are also described.