Condensed Matter, abstract
cond-mat/0205112

From: Arthur F. Hebard <afh@phys.ufl.edu>
Date: Mon, 6 May 2002 22:40:49 GMT   (237kb)

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

Authors: N. Theodoropoulou, A. F. Hebard, M. Gabay, A. K. Majumdar, C. Pace,
J. Lannon, D. Temple
Comments: 5 pages, 4 figures
Subj-class: Materials Science

     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 (GAF) phase. This phase reflects the
     influence of interlayer exchange coupling (IEC) at low temperature
     (T < 140K) 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" (AT) 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.

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