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Low-frequency response in the magnetic susceptibility of antiferromagnetically coupled Fe/Cr multilayers

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DOI: 10.1016/S0304-8853(01)00887-3
PII: S0304-8853(01)00887-3
Copyright © 2001 Published by Elsevier Science B.V. All rights reserved.

F. G. Aliev ^,^,^a, J. L. Martinez^b, V. V. Moshchalkov^c, Y. Bruynseraede^c, A. P. Levanuyk^a and R. Villar^a

^a Dept. de Fisica Materia Condensada, Instituto de Ciencia de Materiales "Nicolas Cabrera", Universidad Autonoma de Madrid, C-III, 28049, Madrid, Spain
^b ICMM-CSIC, Cantoblanco, 28049, Madrid Spain
^c Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U.Leuven, Belgium

Available online 30 October 2001.

The magnetic field and temperature dependence of the low-frequency ( f<10⁴ Hz) in- and out-of-phase magnetic response of antiferromagnetically coupled Fe/Cr(1 0 0) shows that at T>100 K both the real (') and imaginary ('') parts of the susceptibility exhibit hysteretic dependence on the magnetic field with maxima of ''(H) at H±25 Oe. At T=2 K the losses exhibit an unusual strong frequency dependence describable within a single relaxation time scheme. The corresponding relaxation time proves to be strongly field-dependent which could be related to some quantum tunneling processes at low temperatures.

Author Keywords: Multilayers; Susceptibility-AC; Domain wall dynamics; Relaxation

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(15K)
Fig. 1. Real (part a) and imaginary (part b) contributions to the magnetic susceptibility of [Fe(30Å/Cr(13Å)]₁₀ multilayer measured at 987 Hz with ACDF=4 Oe and at different temperatures between 300 K and 5 K.

(16K)
Fig. 2. Imaginary contributions to the magnetic susceptibility of [Fe(30Å/Cr(13Å)]₁₀ multilayer measured at five different frequencies with ACDF=4O e at 2 K. For clarity, the curves

"(H) obtained for 987, 3211 and 9876 Hz are shifted upwards correspondingly on 1.5×10^-8,3×10^-8 and 5×10^-8 emu/Oe. The inset shows the frequency dependence of the dissipation at small non-zero magnetic field (H=50 Oe) at temperature T=2 and 10 K. The bold solid line represents fit described in the main text.

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1. S. Rakhmanova, D.L. Mills and E.E. Fullerton Phys. Rev. B 57 (1998), p. 476. Abstract-INSPEC | $Order Document | Full-text via CrossRef | APS full text

2. R. Schad et al.Appl. Phys. Lett. 64 (1994), p. 3500. Abstract-INSPEC | $Order Document | Full-text via CrossRef

3. P.C.E. Stamp, E.M. Chudnovskii and B. Barbara Int. J .Mod. Phys. 6 (1992), p. 1355. Abstract-INSPEC | $Order Document

Tel.: +34-13-974756; fax: +34-91- 3974744; email: farkhad.aliev@uam.es

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Journal of Magnetism and Magnetic Materials
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