Magnetic recording media with a nialox sub-seedlayer

The present invention relates to magnetic recording media, such as thin film magnetic recording disks, and to a method of manufacturing the media. The present invention has particular applicability to high areal density longitudinal magnetic recording media exhibiting low media noise and enhanced ma...

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Main Authors Harkness, IV, Samuel Dacke, Chen, Qixu (David), Wu, Zhong (Stella), Ranjan, Rajiv Yadav
Format Patent
LanguageEnglish
Published 12.02.2002
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Abstract The present invention relates to magnetic recording media, such as thin film magnetic recording disks, and to a method of manufacturing the media. The present invention has particular applicability to high areal density longitudinal magnetic recording media exhibiting low media noise and enhanced magnetic performance. Magnetic recording media exhibiting enhanced SMNR are formed with an NiAlOsub-seedlayer for microstructural control of the underlayer to enable deposition and growth of a magnetic layer exhibiting a (10{overscore (1)}0)-predominant crystallographic orientation and small, uniform grain size. Embodiments include completely reactive sputter depositing a NiAlOsub-seedlayer on a glass-ceramic substrate and sequentially depositing thereon a NiAl seedlayer, a Cr or Cr-alloy underlayer, e.g., CrMo, a Co-Cr magnetic layer and a protective overcoat, e.g., carbon. The resulting magnetic recording media exhibit a high SMNR, high OW, narrow PW50, improved jitter and improved Hr.
AbstractList The present invention relates to magnetic recording media, such as thin film magnetic recording disks, and to a method of manufacturing the media. The present invention has particular applicability to high areal density longitudinal magnetic recording media exhibiting low media noise and enhanced magnetic performance. Magnetic recording media exhibiting enhanced SMNR are formed with an NiAlOsub-seedlayer for microstructural control of the underlayer to enable deposition and growth of a magnetic layer exhibiting a (10{overscore (1)}0)-predominant crystallographic orientation and small, uniform grain size. Embodiments include completely reactive sputter depositing a NiAlOsub-seedlayer on a glass-ceramic substrate and sequentially depositing thereon a NiAl seedlayer, a Cr or Cr-alloy underlayer, e.g., CrMo, a Co-Cr magnetic layer and a protective overcoat, e.g., carbon. The resulting magnetic recording media exhibit a high SMNR, high OW, narrow PW50, improved jitter and improved Hr.
Author Chen, Qixu (David)
Ranjan, Rajiv Yadav
Harkness, IV, Samuel Dacke
Wu, Zhong (Stella)
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Chen et al. (6117570) 20000900
Chen et al. (5851688) 19981200
Lal et al. (6007924) 19991200
"The Role of NiA1 Underlayers in Longitudinal Recording Media (Abstract)", by Ross et al., Journal of Applied Physics: Proceedings of the 41st Annual Conference on Magnetism and Magnetic Materials, vol. 81, No. 8, Apr. 15, 1997, Part 2A, p. 4369.
Ranjan et al. (5631094) 19970500
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Wu et al. (6110582) 20000800
"NiA1 Underlayers For CoCrTa Magnetic Thin Films" by Lee et al., IEEE Transactions on Magnetics, vol. 30, No. 6, Nov. 1994, pp. 3951-3953.
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Lee et al. (5693426) 19971200
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