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

Volume 182, Issues 1-4
August 2001
Pages 235-242

DOI: 10.1016/S0168-583X(01)00681-4
PII: S0168-583X(01)00681-4
Copyright © 2001 Elsevier Science B.V. All rights reserved.

Probing the growth, structure, and magnetism of epitaxial films by grazing scattering of fast ions

R. Pfandzelter, and H. Winter

Humboldt-Universität zu Berlin, Institut für Physik, Invalidenstrasse 110, 10115 Berlin, Germany

Available online 7 September 2001.

Abstract

Techniques based on grazing scattering of keV light ions to study ultrathin epitaxial films are presented. A key feature of these techniques is an extreme sensitivity to morphology, elemental composition, and magnetic properties of the topmost atomic layer of the films, as demonstrated by recent experiments on Cr, Mn, Fe, and Ir films grown on magnetized Fe(1 0 0) substrates.

PACS classification codes: 79.20.Rf; 75.70.Ak; 68.55.-a; 82.80.Pv

Article Outline

1. Introduction
2. Growth and morphology
3. Chemical composition
4. Magnetic order
4.1. Spin-polarized electron capture
4.2. Spin-polarized electron emission
5. Concluding remarks
Acknowledgements
References


 (15K)
Fig. 1. Sketch of our experimental setup.

(12K)
Fig. 2. Specular intensity (normalized) for 25 keV He+ ions grazingly scattered during growth of Fe on Fe(1 0 0) at the indicated temperature. The vertical lines indicate the opening and closing of the shutter, respectively. The maximum film thickness deposited at 630 K is about 3.2 ML.

(7K)
Fig. 3. Arrhenius plot of saturation island densities obtained from the specular intensity of grazingly scattered 25 keV He+ ions (solid circles). The line is a fit to the data for T470 K. Open squares show STM results from [17].

(19K)
Fig. 4. 25 keV H+- (solid circles, left-hand ordinates) and 4 keV e--induced (open circles, right-hand ordinate) Fe M23VV Auger signal during growth of Ir on Fe(1 0 0) at about 600 K (a) and 300 K (b), respectively. The signals are evaluated from differentiated spectra dN/dE (see insets). The vertical lines indicate the opening of the shutter. Insets: dN/dE spectra (H+-induced) for Ir coverages of 0, 0.6, 1, 1.5, and 2 ML (for clarity, the origins are displaced vertically by constant amounts).

(14K)
Fig. 5. (a) Specular intensity of 25 keV H+ ions grazingly scattered during growth of Mn on Fe(1 0 0) at 300 K (normalized to the value for the uncovered surface). The vertical line indicates the opening of the shutter. (b) Spin polarization of fluorescence light emitted in the HeI 1s2s3S¯1s3p3P, =388.9 nm transition after electron capture by 25 keV He+ ions.

(20K)
Fig. 6. (a) Spin polarization of low-energy (4¯10 eV) secondary electrons excited by grazingly scattered 25 keV H+ ions during growth of Cr on Fe(1 0 0) at 600 K (solid circles) and 300 K (open circles), respectively. (b) Spin polarization of fluorescence light emitted in the HeI 1s2s3S¯1s3p3P transition after electron capture by grazingly scattered 25 keV He+ ions.

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Corresponding author. Tel.: +49-30-2093-7693; fax: +49-30-2093-7899; email: pfandz@physik.hu-berlin.de
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Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume 182, Issues 1-4
August 2001
Pages 235-242


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