Mechanically Balanced Magnetically Unbalanced Magnet Array for HAMR
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Solution Overview
Problem
The existing methods for depositing FePt in the Heat Assisted Magnetic Recording (HAMR) technology face challenges in achieving proper magnetic ordering at lower temperatures, as conventional mechanically unbalanced magnets require high substrate heating, leading to energy wastage and reduced throughput.
Innovation Solution
A device comprising magnetically unbalanced and mechanically balanced magnets is used to deposit FePt on a substrate at a lower temperature, with the magnets positioned to create a balanced structure that allows for proper magnetic ordering, reducing the deposition temperature from 500°C to 250-350°C, and utilizing a plasma ionized chamber to assist in FePt particle ordering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mechanically unbalanced magnets are used for FePt deposition, then proper magnetic ordering can be achieved, but high substrate heating (500°C) is required leading to energy wastage and reduced throughput
Solution Approach 1:
The patent applies asymmetry by using magnets with different magnetic moment magnitudes arranged in a specific asymmetric pattern. This creates a mechanically balanced but magnetically unbalanced configuration that generates the required magnetic field asymmetry for proper FePt magnetic ordering without needing high substrate heating, thus resolving the contradiction between achieving magnetic ordering and reducing energy consumption
2Manufacturing precision
If conventional mechanically unbalanced magnets are used for FePt deposition, then proper magnetic ordering can be achieved, but throughput is reduced due to high temperature processing requirements
Solution Approach 1:
The asymmetric arrangement of magnets with different magnetic moments creates the necessary magnetic field conditions for proper FePt ordering at lower temperatures, enabling faster cooling cycles and higher deposition throughput while maintaining manufacturing precision
3Stability of the object's composition
If magnets are positioned to create mechanical balance, then structural stability is achieved, but magnetic unbalance is reduced
Solution Approach 1:
The patent resolves this contradiction by creating a configuration where magnets are mechanically balanced (symmetric positioning) but magnetically unbalanced (asymmetric magnetic moments). This allows the structure to maintain mechanical stability while the magnetic asymmetry provides the necessary field conditions for proper FePt magnetic ordering
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 efficient FePt deposition at a lower temperature while maintaining proper magnetic ordering, improving the HAMR process and being applicable to other materials and technologies like semiconductor deposition.
Implementation Method 1
utilizing a plasma ionized chamber to assist in FePt particle ordering
Implementation Method 2
The magnets are positioned in the holes. The magnets have a same pole orientation. It is appreciated that the magnets are positioned in the holes to form a mechanically balanced and magnetically unbalanced structure
Data Source
AI summary
A device includes a housing unit and a number of magnets. The housing unit includes a number of holes therein. The magnets are positioned in the holes. The magnets have a same pole orientation. It is appreciated that the magnets are positioned in the holes to form a mechanically balanced and magnetically unbalanced structure.