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Observation of the bulk spin-flop in an Fe/Cr superlattice

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DOI: 10.1016/S0304-8853(01)00894-0
PII: S0304-8853(01)00894-0
Copyright © 2001 Published by Elsevier Science B.V. All rights reserved.

L. Bottyán ^,^,^a, L. Deák^a, J. Dekoster^b, E. Kunnen^c, G. Langouche^b, J. Meersschaut^b, M. Major^a^,^b, D. L. Nagy^a, H. D. Rüter^d, E. Szilágyi^a and K. Temst^c

^a KFKI Research Institute for Particle and Nuclear Physics, P.O. Box 49, 1525 Budapest, Hungary
^b Instituut voor Kern-en Stralingsfysica, K.U. Leuven, Celestijnenlaan 200D B-3001, Leuven, Belgium
^c Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U. Leuven, Celestijnenlaan 200C B-3001, Leuven, Belgium
^d II. Institut für Experimentalphysik Universität Luruper Chaussee 149 D-22761, Hamburg, Germany

Available online 24 October 2001.

The layer magnetisation reorientation transition (spin-flop, SF) was studied in an artificial layer antiferromagnet (AF), namely in MgO(0 0 1)/[⁵⁷Fe(2.6 nm)/Cr(1.3 nm)]₂₀ epitaxial superlattice (SL) by synchrotron Mössbauer reflectometry and Kerr effect (SMOKE). The SF occurs simultaneously in the entire SL stack (bulk SF) in an increasing field of H_SF=13 mT along the easy direction parallel to the layer magnetisations. It is recognised by the kink in the SMOKE loop and by the sharp up-rise of the AF Bragg peak in the delayed Mössbauer reflectivity. The moderate value of observed H_SF is compared with estimations from a spin-chain model and interpreted as due to intraplane domain-wall motion during SF.

Author Keywords: Artificial superlattices; Interlayer coupling; Kerr measurements; Mössbauer spectroscopy; Synchrotron radiation

References

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Fig. 1. Prompt (a) and TISMR (b_¯d) scans of MgO(0 0 1)/[⁵⁷Fe(2.6 nm)/Cr(1.3 nm)]₂₀ superlattice taken in (b): 3 mT, (c): 35.3 mT and (d): repeated 3 mT magnetic fields, respectively. The appearance of the

-order AF Bragg peak shows the reorientation of the layer magnetisations at a bulk SF transition field H_SF. The system of co-ordinates in the insets is fixed to the substrate.

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Fig. 2. Surface magneto-optical Kerr loops of a superlattice MgO(0 0 1)/[⁵⁷Fe(2.6 nm)/Cr(1.3 nm)]₂₀. SF occurs around H_SF=13 mT only once following a 90° rotation of the substrate relative to the field direction.

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3. M. Major, Master's Thesis, Eötvös Loránd University, Budapest, 1999 (in Hungarian).

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15. H.-P. Klein and E. Keller Phys. Rev. 144 (1966), p. 372.

16. D.L. Nagy, L. Bottyán, B. Croonenborghs, L. Deák, B. Degroote, J. Dekoster, H.J. Lauter, V. Lauter_¯Pasyuk, O. Leupold, M. Major, J. Meersschaut, O. Nikonov, A. Petrenko, R. Rüffer, H. Spiering, E. Szilágyi, Phys. Rev. Lett, submitted for publication.

Corresponding author. Tel.: +36-1-392-2761; fax: +36-1-395-9151; email: battyan@rmki.kfki.hu

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