NDLI: MR recording media: microstructure and magnetic properties

Content Provider	IEEE Xplore Digital Library
Author	Ga-Lane Chen
Copyright Year	1965
Abstract	To achieve high recording areal density, it is required that future MR media have high coercivity (H/sub c/), high coercive and remanent squareness (S/sup */ and S), low media noise and narrow track recording performance. The microstructure, which strongly affects magnetic properties, should be fully controlled in media fabrication process. The microstructural characteristics like grain size, grain separation, orientation, lattice mismatch, second phases, and stacking faults can affect intergranular magnetic coupling and media noise. The composition of ternary and quaternary cobalt alloy systems, e.g. CoCrTa, CoCrPt, and CoCrPtTa, has significant effects on magnetic performances. The underlayer design, e.g. Cr, CrV/sub x/, and CrTi/sub x/, can affect lattice mismatch, stacking fault density, and other microstructural features. Stress, shadowing, preferred orientation, and c-axis alignment are four mechanisms which control orientation ratio (OR). Oriented medium has more stress-induced noise than isotropic medium has. Thin film medium with bicrystal structure has 5 dB better SNR than non-bicrystal medium. Ultra clean sputtering process (UC-process) can enhance coercivity and reduce noise. For GMR recording media, it requires Hc>3000 Oe and M/sub r/t <0.5 memu/cm/sup 2/. Media with CoCrPtTa, and CoSm/Cr design will be compared for areal density upto 10 Gb/in/sup 2/. Mechanisms of high coercive force and low noise in MR media are reviewed in connection with microstructure and magnetic properties.
Sponsorship	IEEE Magnetics Society
Starting Page	366
Ending Page	371
Page Count	6
File Size	1964171
File Format	PDF
ISSN	00189464
Volume Number	34
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic recording Microstructure Magnetic properties Coercive force Magnetic noise Lattices Stacking Magnetic separation Chromium Sputtering
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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A study of magnetic recording media on glass substrates

Dependence of magnetic media noise on ultra-thin Cr underlayer thickness

Effect of microstructure on media noise of CoCrTa thin film media fabricated under ultra clean sputtering process

Magnetic and recording characteristics of CoCrTa/Cr thin film media prepared by FT sputtering

Magnetic properties and noise characteristics of high coercivity CoCrPtB/Cr media

Magnetic properties and microstructure of sputtered CoSm/X (X=Ti, V, Cu and Cr) thin films

Thin-film media with compositional gradient for high-density recording

Coercivity-gradient bi-layered thin-film media for longitudinal recording

High density recording on SmCo/Cr thin film media

MR recording media: microstructure and magnetic properties

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