Improvement of recording performances through exchange coupling in triple-layered PMR media |
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Authors: | Sooyoul Hong Na-Young Kim Carl Che Young-Wook Tahk H. Uwazumi |
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Affiliation: | 1. Samsung Information Systems America, 75 West Plumeria Drive, San Jose, CA 95134, USA;2. Samsung Electronics Co. Ltd., Suwon, Kyunggi 443-742, Republic of Korea;3. Fuji Electric Advanced Technology Co. Ltd., 4-18-1 Tsukama, Matsumoto, Nagano 390-0821, Japan |
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Abstract: | Improved recording performances with exchange coupling between bottom magnetic layer and medium magnetic layer in triple-type perpendicular magnetic recording (PMR) media are presented. Fundamentally, triple-type PMR media with exchange coupling between magnetic layers reduces DC erase noise and improves writability. Furthermore, triple-type PMR media could be expected clear magnetic cluster as well as relatively sharp transition pattern. Consequently, better spectral integral signal-to-noise ratio (SpiSNR), improved OW and about 1.5–2.0 order better bit error rate (BER) performances in triple-type PMR media with exchange coupling between magnetic layers were attributed to the reduction of DC erase noise and sharp transition as well as improved writability. In addition, work of micro-magnetic modeling on SNR profiles could help to verify the understanding on the role of exchange coupling between magnetic layers in triple-type PMR media. |
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Keywords: | 75.50.Ss |
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