Write Yoke Stabilizing Layer for EAW Reduction
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Solution Overview
Problem
Current data storage devices face challenges in achieving high data bit density and reliable data access due to residual magnetic flux issues, leading to elevated instances of erase after write (EAW) situations, which reduce data access reliability and increase data access time, especially in reduced form factor devices.
Innovation Solution
A data writer is constructed with a write pole coupled to a yoke configured with a stabilizing layer that stabilizes magnetic domains, using tuned shape anisotropy and magnetic material selection to manipulate the energy landscape and promote Landau closure domain states, thereby reducing unwanted metastable magnetic states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high data bit density is pursued, then data capacity increases, but residual magnetic flux causes erase after write (EAW) situations that reduce data access reliability
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by converting the harmful residual magnetic flux into a beneficial effect. The stabilizing layer, composed of antiferromagnetic material, utilizes the magnetic field to pin domain walls and eliminate metastable states, thereby converting the problematic residual flux into a mechanism for stabilizing magnetic domains and preventing EAW situations.
Solution Approach 2:
The stabilizing layer serves as an intermediary between the write pole and the magnetic storage medium. This intermediate layer mediates the magnetic field interactions by stabilizing the magnetic domains in the yoke, preventing unwanted magnetic flux from affecting adjacent data bits, and thereby improving data access reliability without compromising the high data bit density.
2Quantity of substance
If high data bit density is pursued, then data capacity increases, but data access time increases due to EAW situations
Solution Approach 1:
The patent applies the 'Preliminary action' principle by pre-stabilizing the magnetic domains in the yoke through the stabilizing layer before data writing operations. This preliminary stabilization prevents EAW situations from occurring during normal operation, thereby eliminating the need for additional erase operations and reducing data access time while maintaining high data bit density.
3Reliability
If magnetic domain control is improved, then data writing reliability increases, but device structure becomes more complex
Solution Approach 1:
The patent applies the 'Composite materials' principle by creating a composite structure consisting of the yoke and the stabilizing layer. The stabilizing layer, made of antiferromagnetic material, is deposited on the yoke to provide domain stabilization. This composite approach improves data writing reliability by controlling magnetic domains while adding only a thin layer that minimally increases structural complexity.
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 solution effectively reduces the risk of unwanted magnetic domain configurations, enhances data writing speed and reliability, and allows for quickened magnetic relaxation to closure domains, improving data access operations in high areal density storage devices.
Implementation Method 1
manipulating the energy landscape through tuned shape anisotropy and magnetic material selection
Implementation Method 2
stabilizes magnetic domains present in the yoke
Implementation Method 3
promote Landau closure domain states
Data Source
AI summary
An apparatus is provided that generally relates to a data writer that may be constructed with a write pole coupled to a yoke. The yoke may be configured with a stabilizing layer that stabilizes magnetic domains present in the yoke. In some embodiments, the yoke has first and second sub-yokes.