研究目的
To analyze how the magnetic field due to various data patterns impacts the read head behavior under off-track reading conditions.
研究成果
The performance of hard biased read sensor at off-track reading is significantly influenced by the media magnetic field. A model for calculating reader resistance to account for noncoherent rotation of the local magnetic moment is effective for studying reader performance at off-track reading. This effect is important for recording schemes like SMR and 2-DMR, especially with higher coercivity media and extremely small head to media spacing.
研究不足
The study focuses on the influence of media magnetic field on the dc resistance and thermal magnetic noise of the sensor, but may not cover all noise mechanisms or conditions.
1：Experimental Design and Method Selection:
The analysis is based on micromagnetic modeling of the state of magnetization in the read sensor, considering external magnetic fields due to both the hard bias and the media magnetization pattern.
2：Sample Selection and Data Sources:
The study uses a TMR read sensor with specific parameters and a granular medium with defined properties.
3：List of Experimental Equipment and Materials:
A TMR read sensor with hard bias on both sides, placed between two shields, and a granular medium.
4：Experimental Procedures and Operational Workflow:
The magnetic field due to the magnetization pattern and the hard bias is analyzed using a finite element method solving the governing Maxwell equations. Two cases are studied with different polarizations of neighboring tracks.
5：Data Analysis Methods:
The reader resistance is calculated based on the state of magnetization inside the read sensor element obtained using micromagnetic analysis.
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