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Ion Beam Stabilization of FePt Nanoparticle Arrays for Magnetic Storage Media

Published online by Cambridge University Press:  15 February 2011

J.E.E. Baglin ,
Shouheng Sun ,
A.J. Kellock ,
T. Thomson ,
M.F. Toney ,
B.D. Terris  and
C.B. Murray
J.E.E. Baglin
Affiliation:
IBM Almaden Research Center, San Jose, CA 95120; Materials Research Institute, Northwestern University, Evanston, IL 60208-3116;
Shouheng Sun
Affiliation:
IBM T.J. Watson Research Center, Yorktown Heights, NY 10598;
A.J. Kellock
Affiliation:
IBM Almaden Research Center, San Jose, CA 95120;
T. Thomson
Affiliation:
IBM Almaden Research Center, San Jose, CA 95120; Hitachi San Jose Research Center, San Jose, CA 95120.
M.F. Toney
Affiliation:
IBM Almaden Research Center, San Jose, CA 95120; Stanford Synchrotron Radiation Laboratory, SLAC, Menlo Park, CA 94025.
B.D. Terris
Affiliation:
IBM Almaden Research Center, San Jose, CA 95120; Hitachi San Jose Research Center, San Jose, CA 95120.
C.B. Murray
Affiliation:
IBM T.J. Watson Research Center, Yorktown Heights, NY 10598;
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Abstract

We describe the use of ion beam induced crosslinking to harden the organic matrix material of self-assembled arrays of monodisperse (4 nm) FePt nanoparticles, providing diamondlike carbon barriers to inhibit agglomeration of the nanoparticles under heat treatment. Such stabilization is necessary for the particles to survive the >500°C annealing required for growth of the fct L10 phase of FePt, whose magnetic anisotropy is necessary for application of such arrays for high density recording. Selective area irradiation of continuous nanoparticle coatings, using ion beams patterned over a full disk by stencil mask or with ion projection optics, followed by dissolution of the unexposed coating, is proposed as a means of fabricating extended bit patterns consisting of isolated “islands” of FePt nanoparticles, with characteristic dimensions of tens of nanometers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 777: Symposium A – Nanostructuring Materials with Energetic Beams , 2003 , T6.5
Copyright
Copyright © Materials Research Society 2003

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