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Temperature dependence of interlayer coupling in Fe/Cr superlattices _¯¯ FMR studies

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Journal of Magnetism and Magnetic Materials

Volumes 226-230, Part 2
May 2001
Pages 1779-1781

DOI: 10.1016/S0304-8853(00)01013-1
PII: S0304-8853(00)01013-1
Copyright © 2001 Elsevier Science B.V. All rights reserved.

A. B. Drovosekov^a, D. I. Kholin^a, N. M. Kreines ^,^,^a, O. V. Zhotikova^a and S. O. Demokritov^b

^a P.L. Kapitsa Institute for Physical Problems, Russian Academy of Sciences, Kosygina Str. 2, 117334 Moscow, GSP-1, Russia
^b Fachbereich Physik, Universitaet Kaiserslautern, 67663 Kaiserslautern, Germany

Available online 14 November 2001.

The ferromagnetic resonance in a [Fe(30 Å)/Cr(10 Å)]₁₀ superlattice with a relatively large value of biquadratic coupling constant was studied in a temperature range from 400 K down to liquid-nitrogen temperature. The monocrystalline sample was grown by means of the MBE technique on a MgO [1 0 0] substrate. Measurements were performed in magnetic fields up to 10 kOe at frequencies ranging from 17 to 37 GHz under both transversal and longitudinal FMR excitations. Resonance spectra with several modes including the acoustic and the optical branches were observed in the whole temperature range. Temperature dependence of both bilinear and biquadratic coupling constants was derived from the experimental spectra.

Author Keywords: Multilayers_¯¯metallic; Exchange coupling_¯¯biquadratic; Ferromagnetic resonance

Materials: MgO; Fe; Cr; Fe/Cr; Fe/Cr/Fe

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(11K)
Fig. 1. FMR spectra for a [Fe(30 Å)/Cr(10 Å)]₁₀ superlattice at two different temperatures with magnetic field applied along the hard magnetization axis of iron in the film plane. Points _¯¯ experimental data, solid curves _¯¯ results of numerical simulation (see in text). Error bars represent the observed line width when it exceeds the point size.

(5K)
Fig. 2. Temperature dependence of saturation field H_S and coupling constants J₁ and J₂. The lines are guides to the eye.

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6. A.B. Drovosekov, O.V. Zhotikova, N.M. Kreines, D.I. Kholin, V.F. Meshcheryakov, M.A. Milyaev, L.N. Romashev and V.V. Ustinov. JETP 89 (1999), p. 986. OJPS full text | Full-text via CrossRef

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Corresponding author. Tel.: +7-095-9382029; fax: +7-095-9382030; email: kreines@kapitza.ras.ru

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Journal of Magnetism and Magnetic Materials
Volumes 226-230, Part 2
May 2001
Pages 1779-1781

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