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Atomically Layered Structures for Perpendicular Magnetic Information Storage

Published online by Cambridge University Press:  15 February 2011

Bruce M. Lairson ,
M. R. Visokay ,
R. Sinclair ,
S. M. Brennan ,
B. M. Clemens ,
J. Perez  and
C. Baldwin
Bruce M. Lairson
Affiliation:
Materials Science Department, Rice University, Houston TX.
M. R. Visokay
Affiliation:
Materials Science and Engineering Department, Stanford University, Stanford, CA.
R. Sinclair
Affiliation:
Materials Science and Engineering Department, Stanford University, Stanford, CA.
S. M. Brennan
Affiliation:
Materials Science and Engineering Department, Stanford University, Stanford, CA.
B. M. Clemens
Affiliation:
Materials Science and Engineering Department, Stanford University, Stanford, CA.
J. Perez
Affiliation:
Censtor Corporation, San Jose, CA.
C. Baldwin
Affiliation:
Censtor Corporation, San Jose, CA.
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Abstract

Layered structures can possess a high volumetric density of interfaces, which can result in novel magnetic properties. We report magnetic characteristics of two types of atomically layered structures, (001) oriented intermetallics with the CuAu(I) crystal structure and (111) oriented artificial multilayers. C-axis oriented superlattices of PtFe, PtCo, PdFe and PdCo with the layered CuAu(I) structure, possess large magnetic anisotropies and novel magneto-optic properties relative to the corresponding random alloys. These films are produced by annealing, with tetragonality and magnetic anisotropy developing in a fashion which depends on the initial bilayer period and annealing parameters. (111) oriented artificially grown Pd/CoCr multilayers are reported for perpendicular magnetic recording applications. Using a perpendicular contact probe transducer, the multilayers exhibit two times the readback signal of CoCr media. The multilayers can be made with low roughness suitable for contact recording, and can generate narrow readback pulses with large amplitude. Many aspects of Pd/Co performance, such as overwrite, can be predictably optimized for a given set of transducer properties. The reported results show that compositionally modulated structures can be made which have a wide variety of useful properties for perpendicular hard disk and magneto-optic recording.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 343: Symposium H – Polycrystalline Thin Films - Structure, Texture, Properties and Applications , 1994 , 359
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

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