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doi:10.1016/S0304-8853(02)01532-9
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Copyright © 2003 Elsevier Science B.V. All rights reserved.


    Coexistence of glassy antiferromagnetism and giant magnetoresistance
    in Fe/Cr multilayer structures

N. Theodoropouloua <#aff1>, A. F. HebardCorresponding Author Contact
Information <#m4.cor*>, E-mail The Corresponding Author
<mailto:afh@phys.ufl.edu>, a <#aff1>, M. Gabayb <#aff2>, A. K. Majumdarc
<#aff3>, C. Paced <#aff4>, J. Lannond <#aff4> and D. Templed <#aff4>

a Department of Physics, University of Florida, Gainesville, FL
32611-8440, USA
b Laboratoire de Physique des Solides, Bat 510, Universite Paris-Sud,
91405, Orsay Cedex, France
c Department of Physics, Indian Institute of Technology, Kanpur 208016,
India
d MCNC, Electronics Technologies Division, Research Triangle Park, NC
27709, USA

Received 7 August 2002;  revised 28 November 2002.  Available online 24
January 2003.


    Abstract

Using temperature-dependent magnetoresistance and magnetization
measurements on Fe/Cr multilayers that exhibit pronounced giant
magnetoresistance (GMR), we have found evidence for the presence of a
glassy antiferromagnetic phase. This phase reflects the influence of
interlayer exchange coupling (IEC) at low temperature (T<140 K) and is
characterized by a field-independent glassy transition temperature, Tg,
together with irreversible behavior having logarithmic time dependence
below a "de Almeida and Thouless" critical field line. At room
temperature, where the GMR effect is still robust, IEC plays only a
minor role, and it is the random potential variations acting on the
magnetic domains that are responsible for the antiparallel interlayer
domain alignment.

PACS classification codes: 75.70.Pa


    Article Outline

• References
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Enlarge Image
</science?_ob=MiamiCaptionURL&_method=retrieve&_udi=B6TJJ-47S69WG-5&_image=fig1&_ba=1&_user=875668&_coverDate=07%2F31%2F2003&_handle=V-WA-A-W-BB-MsSAYWA-UUW-U-AAAWAEYEEZ-AAUEDDEDEZ-ECUAUVDDB-BB-U&_rdoc=5&_fmt=summary&_orig=browse&_srch=%23toc%235312%232003%23997369998%23434498!&_cdi=5312&view=c&_acct=C000046981&_version=1&_urlVersion=0&_userid=875668&md5=6f36142ca7314c79944ce36bbe5e0032>
(9K)
Fig. 1. Magnetization of a multilayer sample ([Fe(20Å)/Cr(12Å)]×30)
normalized to the weight of iron plotted as a function of temperature at
the indicated fields. The data at each field are taken in pairs: the
open(solid) symbols referring to the FC (ZFC) procedure. The vertical
arrows and dashed line are described in the text. Inset, dependence of
the GMR ratio on applied field for the same film at 300 K (left axis)
and at 10 K (right axis).

Enlarge Image
</science?_ob=MiamiCaptionURL&_method=retrieve&_udi=B6TJJ-47S69WG-5&_image=fig2&_ba=2&_user=875668&_coverDate=07%2F31%2F2003&_handle=V-WA-A-W-BB-MsSAYWA-UUW-U-AAAWAEYEEZ-AAUEDDEDEZ-ECUAUVDDB-BB-U&_rdoc=5&_fmt=summary&_orig=browse&_srch=%23toc%235312%232003%23997369998%23434498!&_cdi=5312&view=c&_acct=C000046981&_version=1&_urlVersion=0&_userid=875668&md5=ce8467fa134969c4a8493593bb568073>
(6K)
Fig. 2. Temperature dependence of the relative changes in resistance at
the fields indicated in the legend for the same sample characterized in
Fig. 1 <#fig1>. For each data point, the sample was ZFC as described in
the text. The vertical arrows indicate the positions of the maxima for
each field and define a critical field dependence similar to that
defined by the maxima of the ZFC magnetizations in Fig. 1 <#fig1>.

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</science?_ob=MiamiCaptionURL&_method=retrieve&_udi=B6TJJ-47S69WG-5&_image=fig3&_ba=3&_user=875668&_coverDate=07%2F31%2F2003&_handle=V-WA-A-W-BB-MsSAYWA-UUW-U-AAAWAEYEEZ-AAUEDDEDEZ-ECUAUVDDB-BB-U&_rdoc=5&_fmt=summary&_orig=browse&_srch=%23toc%235312%232003%23997369998%23434498!&_cdi=5312&view=c&_acct=C000046981&_version=1&_urlVersion=0&_userid=875668&md5=e9ad4c97b2060dae556906ebc987d31a>
(6K)
Fig. 3. Critical field lines for the 30 layer [Fe(20Å)/Cr(12Å)] (solid
circles and open triangles) sample shown in Fig. 1 <#fig1> and for a
second 30 layer [Fe(20Å)/Cr(10Å)] (solid squares) multilayer sample with
smaller Cr spacer thickness. The solid symbols refer to determinations
using the experimental Tm(H)'s of ZFC magnetizations and the open
triangles are determined by similar peaks in the resistance
measurements. Inset, plot of the high temperature points (solid circles)
showing the AT scaling dependence for spin glasses.

Enlarge Image
</science?_ob=MiamiCaptionURL&_method=retrieve&_udi=B6TJJ-47S69WG-5&_image=fig4&_ba=4&_user=875668&_coverDate=07%2F31%2F2003&_handle=V-WA-A-W-BB-MsSAYWA-UUW-U-AAAWAEYEEZ-AAUEDDEDEZ-ECUAUVDDB-BB-U&_rdoc=5&_fmt=summary&_orig=browse&_srch=%23toc%235312%232003%23997369998%23434498!&_cdi=5312&view=c&_acct=C000046981&_version=1&_urlVersion=0&_userid=875668&md5=6ee06a138c4668204cc52492d4126e4f>
(6K)
Fig. 4. Schematic of phase diagram in the H–T plane showing the
relationship between the GAF, the AF and the paramagnetic (PM) phases.
The axes are normalized as discussed in the text. The GT and AT line
(dashed) are described in the text. For our samples the disorder is
sufficiently large (i.e., ΔJsimilar, equalsJAF) and the field
sufficiently low to ensure that the presence of an AF phase is obscured
on the transition from the PM to GAF phase (horizontal dashed arrow).


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