Effects of ion irradiation on cobalt nanocomposite

L. G. Jacobsohn; Joe David Thompson; Yongqiang Wang; A. Misra; Roland K Schulze; M. Nastasi

doi:10.1016/j.nimb.2006.04.110

Effects of ion irradiation on cobalt nanocomposite

L. G. Jacobsohn
, Joe David Thompson
, Yongqiang Wang
, A. Misra
, Roland K Schulze
, M. Nastasi

Los Alamos National Laboratory

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The effects of ion irradiation of 3-dimensional arrays of Co nanoparticles were investigated. Arrays were obtained by electron beam deposition of 15 Co/SiO₂ bilayers 0.5 and 20 nm thick, respectively. The Co layers consist of Co nanoparticles 3.2 nm in diameter with a standard deviation of 16%. Irradiation was carried out using combinations of 150 kV Ar²⁺ and 90 kV Ar⁺ ion bombardments with a Ar⁺:Ar²⁺ fluence ratio of 1:4. The effects of ion irradiation were followed by Rutherford backscattering, measurements of hysteresis loops at 5 K and of temperature-dependent field-cooled (FC) and zero-field-cooled (ZFC) measurements of the magnetic susceptibility. A decrease of the peak temperature in the ZFC curve for displacements per atom (DPA) up to 1.1 was observed. Irradiation also induces progressively lower coercivity values. The Co particles showed a remarkable high resistance to ion irradiation, surviving damage up to 33 DPA.

Original language	English
Pages (from-to)	201-205
Number of pages	5
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	250
Issue number	1-2 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.nimb.2006.04.110
State	Published - Sep 1 2006

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title = "Effects of ion irradiation on cobalt nanocomposite",

abstract = "The effects of ion irradiation of 3-dimensional arrays of Co nanoparticles were investigated. Arrays were obtained by electron beam deposition of 15 Co/SiO2 bilayers 0.5 and 20 nm thick, respectively. The Co layers consist of Co nanoparticles 3.2 nm in diameter with a standard deviation of 16\%. Irradiation was carried out using combinations of 150 kV Ar2+ and 90 kV Ar+ ion bombardments with a Ar+:Ar2+ fluence ratio of 1:4. The effects of ion irradiation were followed by Rutherford backscattering, measurements of hysteresis loops at 5 K and of temperature-dependent field-cooled (FC) and zero-field-cooled (ZFC) measurements of the magnetic susceptibility. A decrease of the peak temperature in the ZFC curve for displacements per atom (DPA) up to 1.1 was observed. Irradiation also induces progressively lower coercivity values. The Co particles showed a remarkable high resistance to ion irradiation, surviving damage up to 33 DPA.",

author = "Jacobsohn, \{L. G.\} and Thompson, \{Joe David\} and Yongqiang Wang and A. Misra and Schulze, \{Roland K\} and M. Nastasi",

year = "2006",

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doi = "10.1016/j.nimb.2006.04.110",

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journal = "Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms",

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TY - JOUR

T1 - Effects of ion irradiation on cobalt nanocomposite

AU - Jacobsohn, L. G.

AU - Thompson, Joe David

AU - Wang, Yongqiang

AU - Misra, A.

AU - Schulze, Roland K

AU - Nastasi, M.

PY - 2006/9/1

Y1 - 2006/9/1

N2 - The effects of ion irradiation of 3-dimensional arrays of Co nanoparticles were investigated. Arrays were obtained by electron beam deposition of 15 Co/SiO2 bilayers 0.5 and 20 nm thick, respectively. The Co layers consist of Co nanoparticles 3.2 nm in diameter with a standard deviation of 16%. Irradiation was carried out using combinations of 150 kV Ar2+ and 90 kV Ar+ ion bombardments with a Ar+:Ar2+ fluence ratio of 1:4. The effects of ion irradiation were followed by Rutherford backscattering, measurements of hysteresis loops at 5 K and of temperature-dependent field-cooled (FC) and zero-field-cooled (ZFC) measurements of the magnetic susceptibility. A decrease of the peak temperature in the ZFC curve for displacements per atom (DPA) up to 1.1 was observed. Irradiation also induces progressively lower coercivity values. The Co particles showed a remarkable high resistance to ion irradiation, surviving damage up to 33 DPA.

AB - The effects of ion irradiation of 3-dimensional arrays of Co nanoparticles were investigated. Arrays were obtained by electron beam deposition of 15 Co/SiO2 bilayers 0.5 and 20 nm thick, respectively. The Co layers consist of Co nanoparticles 3.2 nm in diameter with a standard deviation of 16%. Irradiation was carried out using combinations of 150 kV Ar2+ and 90 kV Ar+ ion bombardments with a Ar+:Ar2+ fluence ratio of 1:4. The effects of ion irradiation were followed by Rutherford backscattering, measurements of hysteresis loops at 5 K and of temperature-dependent field-cooled (FC) and zero-field-cooled (ZFC) measurements of the magnetic susceptibility. A decrease of the peak temperature in the ZFC curve for displacements per atom (DPA) up to 1.1 was observed. Irradiation also induces progressively lower coercivity values. The Co particles showed a remarkable high resistance to ion irradiation, surviving damage up to 33 DPA.

UR - https://www.scopus.com/pages/publications/33746486389

U2 - 10.1016/j.nimb.2006.04.110

DO - 10.1016/j.nimb.2006.04.110

M3 - Article

SN - 0168-583X

VL - 250

SP - 201

EP - 205

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

IS - 1-2 SPEC. ISS.

ER -

Effects of ion irradiation on cobalt nanocomposite

Abstract

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