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doi:10.1016/S0304-8853(01)00887-3
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Copyright © 2002 Elsevier Science B.V. All rights reserved.


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

F. G. AlievCorresponding Author Contact Information <#m4.cor*>, E-mail
The Corresponding Author <mailto:farkhad.aliev@uam.es>, a <#aff1>, J. L.
Martinezb <#aff2>, V. V. Moshchalkovc <#aff3>, Y. Bruynseraedec <#aff3>,
A. P. Levanyuka <#aff1> and R. Villara <#aff1>

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.


    Abstract

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 (small chi, Greek′) and imaginary (small chi, Greek″) parts of
the susceptibility exhibit hysteretic dependence on the magnetic field
with maxima of small chi, Greek″(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


    Article Outline

• References
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(17K)
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.

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(17K)
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 small chi, Greek"(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.


    References

1. S. Rakhmanova, D.L. Mills and E.E. Fullerton Phys. Rev. B 57 (1998),
p. 476. Abstract-INSPEC
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2. R. Schad et al.Appl. Phys. Lett. 64 (1994), p. 3500. Abstract-INSPEC
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Corresponding Author Contact Information <#m4.bcor*> Corresponding
author. Tel.: +34-13-974756; fax: +34-91- 3974744; email:
farkhad.aliev@uam.es <mailto:farkhad.aliev@uam.es>



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