Curvature and Skew in Heat-Assisted Magnetic Recording
| العنوان: | Curvature and Skew in Heat-Assisted Magnetic Recording |
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| المؤلفون: | Stephanie Hernandez, Chris Rea, Ian Gilbert, Michael Allen Seigler, Ganping Ju, Steven Granz, Zengyuan Liu, Hua Zhou, Tim Rausch, John W. Dykes, Martin G. Blaber, Pin-Wei Huang, Jan-Ulrich Thiele, Chubing Peng |
| المصدر: | IEEE Transactions on Magnetics. 55:1-8 |
| بيانات النشر: | Institute of Electrical and Electronics Engineers (IEEE), 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | 010302 applied physics, Physics, Mathematical analysis, Skew, Curvature, 01 natural sciences, Noise (electronics), Electronic, Optical and Magnetic Materials, Temperature gradient, Signal-to-noise ratio, Heat-assisted magnetic recording, Position (vector), Rise time, 0103 physical sciences, Electrical and Electronic Engineering |
| الوصف: | Curvature of recorded bit and skew are two factors limiting further improvement of the areal density capacity of heat-assisted magnetic recording. Performance degradation due to curvature and skew is evaluated using micromagnetic modeling and spin-stand measurements. Here, we propose two techniques for curvature reduction. One is a forked writer which can provide a cross-track magnetic field gradient that, combined with the thermal profile, mitigates the curvature of the recorded transitions. The other is a near-field transducer (NFT) design which can provide flat temperature contour at the write positions. The forked writer has practical limitations, such as short rise time requirement and insufficient field gradient, when it is integrated with NFTs. By comparing two types of NFT designs which providing curved and straight transitions, respectively, curvature is shown to be the main noise sources at certain track densities. Curvature reduction can provide more bit error rate gain for the same signal-to-noise ratio improvement. On the other hand, we also show that NFTs producing transitions with less curvature usually have the lower thermal gradient. Therefore, curvature and thermal gradient are two design targets that need to be balanced to provide the best recording performance. We also investigate the effect of recording skew on curvature at fixed linear velocity. At skew, the reader sees more curvature, which is one of the primary noise sources at non-zero skew. Consequently, the cross-track reader position should be optimized as a function of skew angle to reduce the effect of curvature. |
| تدمد: | 1941-0069 0018-9464 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::bb9d9f8c7f1dcb2d2be831757a312fcc https://doi.org/10.1109/tmag.2018.2868128 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........bb9d9f8c7f1dcb2d2be831757a312fcc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19410069 00189464 |
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