Dependence of Co particle size on the growth rate in the MBE grown Co/Au superparamagnetic multilayers

J. Xu; M. A. Howson; E. Kolb; P. Veillet; A. Petford-Long

doi:10.1016/S0304-8853(98)00327-8

Dependence of Co particle size on the growth rate in the MBE grown Co/Au superparamagnetic multilayers

J. Xu, M. A. Howson^*, E. Kolb, P. Veillet, A. Petford-Long

^*Corresponding author for this work

Materials Science and Engineering

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

6 Scopus citations

Abstract

In this paper, we show that Co\Au multilayers grown by MBE exhibit superparamagnetic properties when the Co thickness is below 4 Å. By varying the growth rate of Co layers, it was found that for the same nominal thickness (3 Å) the Co particle sizes change with the growth rate. This change is observed in the zero-field-cooled and field-cooled magnetisation measurement and is due to the change of number of nucleation sites with growth rate. This result is in good agreement with the nucleation theory for epitaxial thin films. High-resolution TEM (HREM) measurement was performed on these samples and it was found that Co grows as 2 monolayer thick islands and exhibits relative uniform distribution of particle sizes.

Original language	English (US)
Pages (from-to)	35-42
Number of pages	8
Journal	Journal of Magnetism and Magnetic Materials
Volume	192
Issue number	1
DOIs	https://doi.org/10.1016/S0304-8853(98)00327-8
State	Published - Feb 1 1999

Funding

We are greatly indebted to the EPSRC for the continuous support for the MBE grant and also a grant from the UK–Israel Science and Technology Research Fund which has made this work possible.

Keywords

70.75
MBE
Multilayers
Nucleation
Superparamagnetism

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/S0304-8853(98)00327-8

Cite this

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title = "Dependence of Co particle size on the growth rate in the MBE grown Co/Au superparamagnetic multilayers",

abstract = "In this paper, we show that Co\Au multilayers grown by MBE exhibit superparamagnetic properties when the Co thickness is below 4 {\AA}. By varying the growth rate of Co layers, it was found that for the same nominal thickness (3 {\AA}) the Co particle sizes change with the growth rate. This change is observed in the zero-field-cooled and field-cooled magnetisation measurement and is due to the change of number of nucleation sites with growth rate. This result is in good agreement with the nucleation theory for epitaxial thin films. High-resolution TEM (HREM) measurement was performed on these samples and it was found that Co grows as 2 monolayer thick islands and exhibits relative uniform distribution of particle sizes.",

keywords = "70.75, MBE, Multilayers, Nucleation, Superparamagnetism",

author = "J. Xu and Howson, {M. A.} and E. Kolb and P. Veillet and A. Petford-Long",

note = "Funding Information: We are greatly indebted to the EPSRC for the continuous support for the MBE grant and also a grant from the UK–Israel Science and Technology Research Fund which has made this work possible.",

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AU - Xu, J.

AU - Howson, M. A.

AU - Kolb, E.

AU - Veillet, P.

AU - Petford-Long, A.

N1 - Funding Information: We are greatly indebted to the EPSRC for the continuous support for the MBE grant and also a grant from the UK–Israel Science and Technology Research Fund which has made this work possible.

PY - 1999/2/1

Y1 - 1999/2/1

N2 - In this paper, we show that Co\Au multilayers grown by MBE exhibit superparamagnetic properties when the Co thickness is below 4 Å. By varying the growth rate of Co layers, it was found that for the same nominal thickness (3 Å) the Co particle sizes change with the growth rate. This change is observed in the zero-field-cooled and field-cooled magnetisation measurement and is due to the change of number of nucleation sites with growth rate. This result is in good agreement with the nucleation theory for epitaxial thin films. High-resolution TEM (HREM) measurement was performed on these samples and it was found that Co grows as 2 monolayer thick islands and exhibits relative uniform distribution of particle sizes.

AB - In this paper, we show that Co\Au multilayers grown by MBE exhibit superparamagnetic properties when the Co thickness is below 4 Å. By varying the growth rate of Co layers, it was found that for the same nominal thickness (3 Å) the Co particle sizes change with the growth rate. This change is observed in the zero-field-cooled and field-cooled magnetisation measurement and is due to the change of number of nucleation sites with growth rate. This result is in good agreement with the nucleation theory for epitaxial thin films. High-resolution TEM (HREM) measurement was performed on these samples and it was found that Co grows as 2 monolayer thick islands and exhibits relative uniform distribution of particle sizes.

KW - 70.75

KW - MBE

KW - Multilayers

KW - Nucleation

KW - Superparamagnetism

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Dependence of Co particle size on the growth rate in the MBE grown Co/Au superparamagnetic multilayers

Abstract

Funding

Keywords

ASJC Scopus subject areas

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