Single-Pole/TMR Heads for 140-&amp;gt;tex&amp;lt;$hboxGb/in^2$&amp;gt;/tex&amp;lt;Perpendicular Recording

Nakamoto, K.; Okada, T.; Watanabe, K.; Hoshiya, H.; Yoshida, N.; Kawato, Y.; Hatatani, M.; Meguro, Kenichi; Okada, Y.; Kimura, Hiroshi; Mochizuki, Masafumi; Kusukawa, K.; Ishikawa, Chiaki; Fuyama, M.

doi:10.1109/tmag.2003.821174

Cited by 31 publications

(2 citation statements)

References 14 publications

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“…These soft magnetic properties are very desirable for writer pole application. In addition, the F/N multilayer nano structure can control writer remanence 34 and prevent the occurring of erasure after write (EAW). Generally, the coercivity is a material and thickness dependent magnetic property.…”

Section: Dual-bath Electrodeposition Technique Of (Cofe/nip) Nmentioning

confidence: 99%

Role of p-Hydroxybenzhydrazide Additive in Electrodeposition of Thin NiP Film Used as a Nonmagnetic Spacer in Laminated (CoFe/NiP) Nano Structures

Riemer

Sun

Tabaković

2016

J. Electrochem. Soc.

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Electrodeposition of NiP film used as a thin nanomagneic spacer in laminated multilayer (2.4T CoFe/NiP) n perpendicular writer pole for recording magnetic heads is described. The electrodeposition of laminated multilayers was carried out in a dual-bath automated electroplating tool. The thin NiP films with thickness from 2 to 5 nm were obtained as nonmagnetic amorphous NiP alloys with P-content higher than 18 at. %. The problem of composition gradient at the CoFe/NiP interface was solved by using a p-hydroxybenzhydrazide organic additive in the plating solution. The details of the electrodeposition of NiP films, the role of p-HBHy and properties of electrodeposited NiP films and CoFe/NiP multilayers are discussed.

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Section: Dual-bath Electrodeposition Technique Of (Cofe/nip) Nmentioning

confidence: 99%

Role of p-Hydroxybenzhydrazide Additive in Electrodeposition of Thin NiP Film Used as a Nonmagnetic Spacer in Laminated (CoFe/NiP) Nano Structures

Riemer

Sun

Tabaković

2016

J. Electrochem. Soc.

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“…At a component level, this trend has caused the dimensions to scale down in size. 1,2 Physical reader and write widths have decreased to enable magnetic/electric width to values closed to 3 micro-inches. Various techniques have been developed and used to characterize readers and writers.…”

mentioning

confidence: 99%

Measuring and understanding write width and off-track as a function of linear density in perpendicular recording

Fernandez-de-Castro

Sandler

Hurben

et al. 2012

Journal of Applied Physics

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Multiple techniques have been developed and used to characterize the width of a written track in perpendicular recording. This work investigates written tracks using the WPE (write plus erase) test based on writing the main track at a given density and trimming both sides of the track multiple times with another density. The edge of the original track, after each trimming step, is characterized by a narrow band measurement of the read-back signal as a function of cross-track position. The use of a narrow band filter improves the test SNR and helps separate the track into 2 sections: A good region (track center) and a degraded region (track edge). Test and micro-magnetic analysis were used under multiple linear densities for the main track and for the trimming tracks. The results indicate that the WPE value decreases as the density increased between 200 kfci and 1500 kfci. For densities lower than 200 kfci and higher than 1500 kfci, the WPE value does not change significantly. When the main track was fixed at 200 kfci, increasing the trimming density resulted in a higher WPE. Using a micro-magnetic model and spin-stand tests, it is demonstrated that the apparent increase in WPE is caused by a region with opposite polarity at the edge of the main track (in the media) produced by the magneto-static (demagnetization) field generated by the main track. The section with opposite polarity is found to be coherent with the main track. During the read-back process, the field from the opposite polarity region in the media is integrated by the reader (read sensitivity function) and subtracted from the main track signal. The result is a loss in signal at the track edge that yields a larger WPE value. This phenomenon could have a direct impact on shingled recording.

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Magnetic Information-Storage Materials

Comstock¹

2006

Springer Handbook of Electronic and Photonic Materials

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Single-Pole/TMR Heads for 140->tex<$hboxGb/in^2$>/tex<Perpendicular Recording

Cited by 31 publications

References 14 publications

Role of p-Hydroxybenzhydrazide Additive in Electrodeposition of Thin NiP Film Used as a Nonmagnetic Spacer in Laminated (CoFe/NiP) Nano Structures

Role of p-Hydroxybenzhydrazide Additive in Electrodeposition of Thin NiP Film Used as a Nonmagnetic Spacer in Laminated (CoFe/NiP) Nano Structures

Measuring and understanding write width and off-track as a function of linear density in perpendicular recording

Magnetic Information-Storage Materials

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