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Magnetic coupling in Fe/Cr/Fe(001) by spin-resolved empty-state spectroscopies

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Surface Science

Volumes 454-456
20 May 2000
Pages 909-913

PII: S0039-6028(00)00115-1
Copyright © 2000 Elsevier Science B.V. All rights reserved.

G. Isella ^,, R. Bertacco, L. Duò and F. Ciccacci

INFM _¯¯ Dipartimento di Fisica Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy

Available online 31 May 2000.

We report on a study of empty electronic states in Cr/Fe(001) films and a trilayer as obtained by means of spin-polarized inverse photoemission and absorbed current spectroscopies: both spectroscopies are sensitive to the magnetic character of the Fe film. In relatively thick ( >7 ML) Cr films, our data do not reveal any polarization dependence; on the contrary, in Fe/Cr/Fe(001), we observe a reversal of the magnetic ordering of the Fe overlayer with respect to the buried Fe substrate as a function of the Cr spacer thickness, confirming the oscillating transition from FM to AF coupling between the Fe layers.

Author Keywords: Chromium; Inverse photoemission spectroscopy; Iron; Magnetic films; Magnetic interfaces; Metal_¯metal magnetic thin film structures; Molecular beam epitaxy

1. Introduction
2. Experimental
3. Results and discussion
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(8K)
Fig. 1. IPE spectra for the Fe(001) surface (bottom) and a Cr/Fe(001) system with a 11 ML thick Cr spacer (top). Continuous lines refer to transitions between majority (with respect to the Fe substrate) states, and dotted lines to transition between minority states.

(11K)
Fig. 2. IPE spectra taken (from top to bottom) form: an annealed Fe(001) surface, two Fe/Cr/Fe(001) multilayers with a 11 and 12 ML thick Cr spacer and a 7 ML thick Fe/Fe(001) homoepitaxial film as grown. The majority (continuous lines) or minority (dotted lines) character of the spectral features is again referred to the Fe substrate.

(10K)
Fig. 3. AC spin asymmetry spectra for the Fe(001) surface and two Fe/Cr/Fe multilayers.

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Corresponding author. Fax: +39-2-2399-6126; email: giovanni.isella@polimi.it

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Surface Science
Volumes 454-456
20 May 2000
Pages 909-913

171 of 211

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