Shield Design for Enhanced Reader Resolution

Tuggle, Andrew; Gider, S.; Mauri, D.; Ho, M.

doi:10.1109/tmag.2013.2246783

Cited by 2 publications

(1 citation statement)

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“…The reader sensor stack and the writer pole are less than 50 and 300 nm across, respectively, when looked from a top-down perspective, while most of the read/write block surface is dominated by parallel, rectangular NiFe shields. The shields around the reader are made of electroplated (Ni-rich) Ni 80 Fe 20 permalloy with high magnetic permeability and low coercivity to assure the reader sensor detects only the magnetic field from a single bit transition in the disk at a time [7] [8]. The writer pole has a wrap-around structure to help generate a strong and precise magnetic field that effectively alters the magnetic state of the disk's surface during the data writing process.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Read/Write Head Shield Asperities in Hard Disk Drives

Souza

2023

MSA

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A new way to characterize asperities on metallic surfaces at the nanometer scale is proposed. Asperities are often treated using conventional statistical descriptors such as average and root mean square roughness, which do not provide adequate mechanistic insight into surface defect formation and mitigation. The new rationale revolves around developing a mathematical description of the evolution of the area occupied by asperities at each height slice on a topography image, with direct implications on how asperity instances are tracked and their risk of breakage leading to potential exposure and degradation of the metal surface upon thermo-mechanical stresses during the operation of read/write heads is assessed. The technique was shown to be disruptive by surpassing all other surface quality metrics, such as conventional roughness and static area % asperity at 0.5 nm height, in its ability to statistically differentiate surfaces coming from various manufacturing process iterations tailored to produce different surface conditions in the hard disk drive industry. A theoretical formulation proposing that the static asperity technique is fundamentally insufficient, is presented and validated experimentally.

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Section: Introductionmentioning

confidence: 99%