Diffusion and alloy formation of Co ultrathin films on Pt(111)

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The kinetics of the interdiffusion of Co adatoms on a Pt(111) surface was studied by Auger electron spectroscopy at various temperatures with Co coverage near 1 ML. After annealing, the Co concentration decreases dramatically before it approaches a constant value. The Co-Pt alloy is confined in the few topmost layers. Activation energies and pre-exponential diffusion coefficients are obtained from an Arrhenius plot. The values are 0.90 eV and 6.6×10-11 cm2/s, respectively. They are independent on the coverage in this ultrathin system. After annealing the 1 ML Co ultrathin film on a Pt(111) surface at 600 K, Co atoms diffuse into the first two monolayers only. Both the topmost and the second layers contain 50% of Co atoms. In addition, ultraviolet photoelectron spectroscopy was used to monitor the alloy formation of Co/Pt(111) in the annealing process.

Original languageEnglish
Pages (from-to)3777-3781
Number of pages5
JournalJournal of Applied Physics
Volume80
Issue number7
DOIs
Publication statusPublished - 1996 Oct 1

Fingerprint

annealing
ultraviolet spectroscopy
adatoms
Auger spectroscopy
electron spectroscopy
atoms
diffusion coefficient
plots
photoelectron spectroscopy
activation energy
kinetics
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Diffusion and alloy formation of Co ultrathin films on Pt(111). / Tsay, J. S.; Shern, C. S.

In: Journal of Applied Physics, Vol. 80, No. 7, 01.10.1996, p. 3777-3781.

Research output: Contribution to journalArticle

@article{d7ca75d3ffd84a7e9285f40158cc1f06,
title = "Diffusion and alloy formation of Co ultrathin films on Pt(111)",
abstract = "The kinetics of the interdiffusion of Co adatoms on a Pt(111) surface was studied by Auger electron spectroscopy at various temperatures with Co coverage near 1 ML. After annealing, the Co concentration decreases dramatically before it approaches a constant value. The Co-Pt alloy is confined in the few topmost layers. Activation energies and pre-exponential diffusion coefficients are obtained from an Arrhenius plot. The values are 0.90 eV and 6.6×10-11 cm2/s, respectively. They are independent on the coverage in this ultrathin system. After annealing the 1 ML Co ultrathin film on a Pt(111) surface at 600 K, Co atoms diffuse into the first two monolayers only. Both the topmost and the second layers contain 50{\%} of Co atoms. In addition, ultraviolet photoelectron spectroscopy was used to monitor the alloy formation of Co/Pt(111) in the annealing process.",
author = "Tsay, {J. S.} and Shern, {C. S.}",
year = "1996",
month = "10",
day = "1",
doi = "10.1063/1.363329",
language = "English",
volume = "80",
pages = "3777--3781",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

TY - JOUR

T1 - Diffusion and alloy formation of Co ultrathin films on Pt(111)

AU - Tsay, J. S.

AU - Shern, C. S.

PY - 1996/10/1

Y1 - 1996/10/1

N2 - The kinetics of the interdiffusion of Co adatoms on a Pt(111) surface was studied by Auger electron spectroscopy at various temperatures with Co coverage near 1 ML. After annealing, the Co concentration decreases dramatically before it approaches a constant value. The Co-Pt alloy is confined in the few topmost layers. Activation energies and pre-exponential diffusion coefficients are obtained from an Arrhenius plot. The values are 0.90 eV and 6.6×10-11 cm2/s, respectively. They are independent on the coverage in this ultrathin system. After annealing the 1 ML Co ultrathin film on a Pt(111) surface at 600 K, Co atoms diffuse into the first two monolayers only. Both the topmost and the second layers contain 50% of Co atoms. In addition, ultraviolet photoelectron spectroscopy was used to monitor the alloy formation of Co/Pt(111) in the annealing process.

AB - The kinetics of the interdiffusion of Co adatoms on a Pt(111) surface was studied by Auger electron spectroscopy at various temperatures with Co coverage near 1 ML. After annealing, the Co concentration decreases dramatically before it approaches a constant value. The Co-Pt alloy is confined in the few topmost layers. Activation energies and pre-exponential diffusion coefficients are obtained from an Arrhenius plot. The values are 0.90 eV and 6.6×10-11 cm2/s, respectively. They are independent on the coverage in this ultrathin system. After annealing the 1 ML Co ultrathin film on a Pt(111) surface at 600 K, Co atoms diffuse into the first two monolayers only. Both the topmost and the second layers contain 50% of Co atoms. In addition, ultraviolet photoelectron spectroscopy was used to monitor the alloy formation of Co/Pt(111) in the annealing process.

UR - http://www.scopus.com/inward/record.url?scp=0001425697&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001425697&partnerID=8YFLogxK

U2 - 10.1063/1.363329

DO - 10.1063/1.363329

M3 - Article

AN - SCOPUS:0001425697

VL - 80

SP - 3777

EP - 3781

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 7

ER -