Issue |
Europhys. Lett.
Volume 64, Number 6, December 2003
|
|
---|---|---|
Page(s) | 803 - 809 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2003-00629-y | |
Published online | 01 November 2003 |
Cobalt oxide/ferromagnet bilayers: Exchange coupling and dominance of the antiferromagnet
Hahn-Meitner-Institut Berlin - Glienicker Strasse 100,
D-14109 Berlin, Germany
Received:
15
April
2003
Accepted:
9
October
2003
Using cobalt oxide/ferromagnet bilayers with strong magnetic
coupling, the nature of the interfacial exchange interaction in
exchange bias systems has been investigated. For ,
and
as ferromagnetic materials, an almost
linear temperature dependence of the exchange bias field
and a common blocking temperature
of
175
have been found. Additionally, an inverse
proportionality between
and the thickness of the
ferromagnetic layer
has been confirmed. The average
coupling energies
at T=10
have been determined
to 0.90, 1.02 and 0.80
for
,
and
bilayers, respectively. The
presently observed behavior strongly deviates from recent
theoretical mean-field analysis and other experimental
investigations on antiferromagnetic/ferromagnetic bilayers.
PACS: 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures) / 75.30.Et – Exchange and superexchange interactions / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, 2003
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