Helmholtz Coil PECVD Carbon Source Uniformity
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Solution Overview
Problem
In PECVD carbon source deposition processes, the lack of controlled magnetic fields leads to non-uniform plasma distribution and electron mobility, affecting the uniformity and quality of carbon thin films, which in turn impacts the mechanical and recording performance of media due to variations in carbon thickness and bit error rate.
Innovation Solution
The integration of paired polarity Helmholtz coils with rear button permanent magnets creates a uniform axial magnetic field that confines and reflects electrons, stabilizing the plasma and ensuring uniform carbon deposition on media disks by generating a magnetic bottle effect, thereby controlling plasma density and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If no magnetic field control is applied in PECVD carbon source deposition, then the device structure remains simple, but the plasma distribution becomes non-uniform and electron mobility is uncontrolled, leading to non-uniform carbon thin film deposition
Solution Approach 1:
The patent applies parameter changes by introducing magnetic field parameters (strength, direction, distribution) to control plasma and electron behavior. By adjusting magnetic field parameters, the system achieves uniform plasma distribution and controlled electron mobility, which directly improves carbon thin film uniformity without requiring complex mechanical modifications to the deposition chamber
Solution Approach 2:
The patent replaces mechanical/physical control methods with electromagnetic field control. Instead of using mechanical means to control plasma distribution and electron mobility, the system uses magnetic fields to achieve the same control objectives, resulting in a more elegant solution that improves film uniformity while adding relatively minimal system complexity
2Reliability
If magnetic fields are used to control plasma and electron distribution, then carbon deposition uniformity improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses parameter changes in magnetic field strength and distribution to achieve reliable carbon thickness consistency. By optimizing magnetic field parameters, the system ensures uniform plasma and electron distribution across the substrate, which directly translates to consistent carbon deposition. This approach achieves reliability goals through controllable physical parameters rather than complex mechanical systems
Solution Approach 2:
The magnetic field system serves multiple functions simultaneously: it controls plasma distribution, regulates electron mobility, and ensures uniform carbon deposition. This multi-functionality reduces the need for separate control mechanisms, thereby improving reliability while limiting the increase in device complexity
3Manufacturing precision
If uniform plasma distribution is achieved through magnetic field control, then carbon thin film quality improves, but energy consumption increases due to additional magnetic field generation
Solution Approach 1:
The patent optimizes energy consumption by carefully selecting and adjusting magnetic field parameters. By using moderate magnetic field strengths and optimized coil configurations, the system achieves uniform plasma distribution and high-quality carbon deposition while minimizing the energy required for magnetic field generation. The parameter optimization ensures that energy input is proportional to the quality improvement achieved
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 results in a uniform carbon coating on media disks, enhancing mechanical durability and reducing bit error rates by maintaining consistent carbon thickness, thus improving the overall performance of recording subsystems.
Implementation Method 1
The Helmholtz coil paired polarity module can be configured to include at least two paired electric currents that connect to the paired polarity Helmholtz coils using the present invention. The paired polarity Helmholtz coils can be configured to produce uniform parallel axial magnetic field lines for confining emitted electrons
Implementation Method 2
at least two reflective polarity rear button permanent magnets integrated into the carbon source deposition tools for reflecting emitted electrons
Implementation Method 3
The Helmholtz coil assisted PECVD carbon source deposition process includes: emitting electrons from a 2-sided carbon source deposition tool, confining the emitted electrons using the Helmholtz coil paired polarity module, reflecting the electron emissions using at least two rear button permanent magnet modules for depositing the concentrated electrons uniformly on a 2-sided media disk
Data Source
AI summary
The embodiments disclose an apparatus including at least two carbon source deposition tools for emitting electrons, at least two reflective polarity rear button permanent magnets integrated into the carbon source deposition tools for reflecting emitted electrons, and at least two paired polarity Helmholtz coils integrated into the carbon source deposition tools for forming uniform parallel magnetic field lines for confining the emitted electrons to uniformly deposit carbon onto the surfaces of a two-sided media disk.