Evaluation of gap length fluctuation with harmonic analysis method |
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Authors: | Yipin Zhou Bo Liu Lewei Li |
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Institution: | 1. Data Storage Institute, 5 Engineering Drive 1, Singapore 117608, Singapore;2. Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3 Singapore 117576, Singapore |
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Abstract: | Gap length (GL) of reading head is one of the most critical parameters for high-density magnetic recording systems. A novel method is proposed for quantitative evaluation of the GL fluctuation among a batch of magneto-resistive/giant magneto-resistive heads with same structure design. The method works at head-gimbal assembly level and the evaluation can be done with any read/write analysis equipment. The testing process is based on harmonic analysis of the readback signal. The testing system consists of a selected reference head and sample heads for evaluation. A GL variation function is introduced for the evaluation of GL deviation between the reference head and sample head. This method proved to be easy for implementation and results suggest that variation of GL is considerable and has obvious effect on recording performance in high recording density systems. |
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Keywords: | Gap length evaluation Magnetic readback signal Magnetic integration Magnetic recording |
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