The effect of a trailing shield for perpendicular write heads
| Autor: | Jui-Lung Li, Christian Rene Bonhote, Scott Arthur MacDonald, K. Carey, Mason Lamar Williams, Neil Leslie Robertson, Neil Smith, Quang Le, H. Nguyen, P. A. A. van der Heijden, C. Tsang, L. Nix |
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| Rok vydání: | 2006 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 99:08S304 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.2158390 |
| Popis: | The effect of a magnetic trailing shield located in close proximity of the pole tip for a perpendicular write head has been studied in a perpendicular recording system. For a 150nm wide write pole, the write field gradient is improved yielding a 40% decrease in jitter and 2.2dB increase in the signal-to-noise ratio (SNR). As the pole width is narrowed further, modeling and experiments show that the trailing shield leads to a tradeoff between maintaining a high write field (writeability) and achieving an optimal write field gradient (jitter). For a 70nm writer, the addition of a trailing shield results only in a small 0.5dB SNR gain despite a 25% decrease in jitter as a result of the concomitant loss in writeability. The latter results in an increased dc noise and becomes more significant with trailing shield throat thickness. |
| Databáze: | OpenAIRE |
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