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A New 3D Multistring Code to Identify Compound Oxide Nanophase With Ion Channeling

Published online by Cambridge University Press:  01 February 2011

James Douglas Bradley
Affiliation:
james.bradley@medtronic.com, Arizona St. University, Department of Physics, PO Box 871504, Tempe, AZ, 85287-1504, United States
Nicole Herbots
Affiliation:
herbots@asu.edu, Arizona St. University, Physics and Astronomy, ASU Dept. of Physics and Astronomy, Box 1530, Tempe, AZ, 85287, United States
Robert Culbertson
Affiliation:
robert.culbertson@asu.edu, Arizona St. University, Department of Physics, PO Box 871504, Tempe, AZ, 85287-1504, United States
Justin Shaw
Affiliation:
justin.shaw@nist.gov, NIST Magnetics Group, Magnetics Group, 325 Broadway, Mailstop 818.03, Boulder, CO, 80305, United States
Vasu Atluri
Affiliation:
vasu.atluri@asu.edu, Arizona St. University, Department of Physics, PO Box 871504, Tempe, AZ, 85287-1504, United States
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Abstract

A new 3DMultiString computer code of Ion Beam Analysis (IBA) using 4He++ ion channeling combined with Nuclear Resonance Analysis (NRA) is used to analyze controlled formation of order in continuous layers of silicon dioxide nucleated on (1×1) Si(100) via the Herbots-Atluri clean (U.S. patent 6,613,677 (9/3/2003)) in air at 300 K. In our most recent work, this new 3DMultiString simulations combined with IBA leads to the identification of a new two-dimensional nanophase of tetragonally distorted β-cristobalite SiO2 (annotated b-c SiO2) with a critical thickness of 2 nm from the (1×1) Si (100)/b-c SiO2 interface to the b-c SiO2 /amorphous SiO2 interface (annotated b-c SiO2/a-SiO2). 3DMultiString simulations of IBA data taken on this new b-c SiO2/(1×1) Si(100) interphase includes channeling along the three <100>, <110>, and <111> axes of Si (100) in combination 16OO(α, α)16O 3.045 MeV NRA to measure oxygen areal densities corresponding to nm-thick films. In this way, the critical thickness of the β-c SiO2 nanophase can be established as a function of oxygen coverage.This new 3DMultiSTRING computer code is derived from the original 3DSTRING program that originated at Bell Labs, NJ.

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