Fluctuations in collision cascades

Ion beam mixing

Mikko Hautala (Corresponding Author), Jari Likonen, Ilkka Koponen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We have studied the consequences of statistical fluctuations in collision cascades on mixing of atoms in dense collision cascades. The distributions of energy densities in spherical and cylindrical spikes are obtained from Monte Carlo simulations of collision cascades where a simple model is used for grouping recoils into separate subcascades. The subcascades are approximated as either spherical or cylindrical. In the latter case we find a decrease by a factor of ten and two in the mixing rate when Au is mixed by 7 MeV Ag and 650 keV Kr ions, respectively, if the mean energy deposition is used instead of distribution. New experimental results from 7 MeV Ag ion bombardment of AuPt multilayers at 12 and 300 K are reported. The calculated values for mixing rates agree with the measured values.
Original languageEnglish
Pages (from-to)493-496
Number of pages4
JournalNuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
Volume115
Issue number1-4
DOIs
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

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Ion beams
cascades
ion beams
collisions
Ion bombardment
spikes
bombardment
Multilayers
ions
flux density
Atoms
Ions
atoms
simulation
energy
Monte Carlo simulation

Cite this

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title = "Fluctuations in collision cascades: Ion beam mixing",
abstract = "We have studied the consequences of statistical fluctuations in collision cascades on mixing of atoms in dense collision cascades. The distributions of energy densities in spherical and cylindrical spikes are obtained from Monte Carlo simulations of collision cascades where a simple model is used for grouping recoils into separate subcascades. The subcascades are approximated as either spherical or cylindrical. In the latter case we find a decrease by a factor of ten and two in the mixing rate when Au is mixed by 7 MeV Ag and 650 keV Kr ions, respectively, if the mean energy deposition is used instead of distribution. New experimental results from 7 MeV Ag ion bombardment of AuPt multilayers at 12 and 300 K are reported. The calculated values for mixing rates agree with the measured values.",
author = "Mikko Hautala and Jari Likonen and Ilkka Koponen",
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doi = "10.1016/0168-583X(95)01450-0",
language = "English",
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pages = "493--496",
journal = "Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms",
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Fluctuations in collision cascades : Ion beam mixing. / Hautala, Mikko (Corresponding Author); Likonen, Jari; Koponen, Ilkka.

In: Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, Vol. 115, No. 1-4, 1996, p. 493-496.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Fluctuations in collision cascades

T2 - Ion beam mixing

AU - Hautala, Mikko

AU - Likonen, Jari

AU - Koponen, Ilkka

N1 - Project code: KET4134

PY - 1996

Y1 - 1996

N2 - We have studied the consequences of statistical fluctuations in collision cascades on mixing of atoms in dense collision cascades. The distributions of energy densities in spherical and cylindrical spikes are obtained from Monte Carlo simulations of collision cascades where a simple model is used for grouping recoils into separate subcascades. The subcascades are approximated as either spherical or cylindrical. In the latter case we find a decrease by a factor of ten and two in the mixing rate when Au is mixed by 7 MeV Ag and 650 keV Kr ions, respectively, if the mean energy deposition is used instead of distribution. New experimental results from 7 MeV Ag ion bombardment of AuPt multilayers at 12 and 300 K are reported. The calculated values for mixing rates agree with the measured values.

AB - We have studied the consequences of statistical fluctuations in collision cascades on mixing of atoms in dense collision cascades. The distributions of energy densities in spherical and cylindrical spikes are obtained from Monte Carlo simulations of collision cascades where a simple model is used for grouping recoils into separate subcascades. The subcascades are approximated as either spherical or cylindrical. In the latter case we find a decrease by a factor of ten and two in the mixing rate when Au is mixed by 7 MeV Ag and 650 keV Kr ions, respectively, if the mean energy deposition is used instead of distribution. New experimental results from 7 MeV Ag ion bombardment of AuPt multilayers at 12 and 300 K are reported. The calculated values for mixing rates agree with the measured values.

U2 - 10.1016/0168-583X(95)01450-0

DO - 10.1016/0168-583X(95)01450-0

M3 - Article

VL - 115

SP - 493

EP - 496

JO - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms

SN - 0168-583X

IS - 1-4

ER -