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The Strain-Assisted Nucleation and Growth Behavior of Co Islands: An Indirect Study of Nanopatterning Using the Remanent Magnetization Measurement (Δm)

Published online by Cambridge University Press:  21 March 2011

Yong-Won Lee  and
Bruce M. Clemens
Yong-Won Lee
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, U.S.A.
Bruce M. Clemens
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, U.S.A.
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Abstract

Nanopatterning through strain-assisted nucleation of metal adatom islands is experimentally studied using a magnetic remanence or Δm measurement. The strain field is generated by a square array of interfacial misfit dislocations with a spacing of 4.1 nm due to the lattice mismatch of the epitaxial Pt(002) film on MgO(002) substrates. The intensity of strain is controlled by changing the thickness of the Pt underlayer ranging from 2.0 to 10.0 nm. The amount of exchange coupling among the Co grains grown on Pt template is measured using the μm technique as an indirect indicator of magnetic grain distribution. From the measured μm values, the morphology of adatom islands is indirectly deduced. The Co islands on a 5.0 nm thick Pt underlayer show the overall negative behavior of Δm curve, i.e., the strongest nanopatterning effect. Strain driven nucleation is found to be achievable through a narrow selection of experimental growth conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 818: Symposium M – Nanoparticles and Nanowire Building Blocks-Synthesis, Processing, Characterization and Theory , 2004 , M5.35.1
Copyright
Copyright © Materials Research Society 2004

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