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Observation of Micromagnetic Structure in Computer Hard Disks by Lorentz Transmission Electron Microscopy

Published online by Cambridge University Press:  15 February 2011

K. Tang ,
M.R. Visokay ,
R. Sinclair ,
C.A. Ross ,
R. Ranjan  and
T. Yamashita
K. Tang
Affiliation:
Dept. of Materials Science and Engineering, Stanford University, Stanford, CA 94305
M.R. Visokay
Affiliation:
Dept. of Materials Science and Engineering, Stanford University, Stanford, CA 94305
R. Sinclair
Affiliation:
Dept. of Materials Science and Engineering, Stanford University, Stanford, CA 94305
C.A. Ross
Affiliation:
R&D, Komag Inc., Milpitas, CA 95035
R. Ranjan
Affiliation:
R&D, Komag Inc., Milpitas, CA 95035
T. Yamashita
Affiliation:
R&D, Komag Inc., Milpitas, CA 95035
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Abstract

We have observed micromagnetic structure in real computer hard disks with the typical structure of C/Co alloy/Cr/NiP/Al(substrate) using Lorentz transmission electron microscopy (LTEM). A chemical etching method was introduced to successfully prepare LTEM specimens directly from the computer hard disks with both smooth and mechanically textured substrates. Micromagnetic structural features, e.g., ripples and vortices, were studied in disks in bitswritten, ac-demagnetized, and saturation remanent magnetic states.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 384: Symposium L – Magnetic Ultrathin films, Multilayers and Surfaces , 1995 , 21
Copyright
Copyright © Materials Research Society 1995

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References

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