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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2002     Display Documents

ID: 7382.0, MPI für Festkörperforschung / FKF Publikationen 2002
Ferromagnetism in one-dimensional monatomic metal chains
Authors:Gambardella, P.; Dallmeyer, A.; Maiti, K.; Malagoli, M. C.; Eberhardt, W.; Kern, K.; Carbone, C.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Nature
Issue / Number:6878
Start Page:301
End Page:304
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Two-dimensional systems, such as ultrathin epitaxial films and
superlattices, display magnetic properties distinct from bulk
materials(1). A challenging aim of current research in
magnetism is to explore structures of still lower
dimensionality(2-6). As the dimensionality of a physical system
is reduced, magnetic ordering tends to decrease as fluctuations
become relatively more important(7). Spin lattice models
predict that an infinite one-dimensional linear chain with
short-range magnetic interactions spontaneously breaks up into
segments with different orientation of the magnetization,
thereby prohibiting long-range ferromagnetic order at a finite
temperature(7-9). These models, however, do not take into
account kinetic barriers to reaching equilibrium or
interactions with the substrates that support the one-
dimensional nanostructures. Here we demonstrate the existence
of both short- and long-range ferromagnetic order for one-
dimensional monatomic chains of Co constructed on a Pt
substrate. We find evidence that the monatomic chains consist
of thermally fluctuating segments of ferromagnetically coupled
atoms which, below a threshold temperature, evolve into a
ferromagnetic long-range-ordered state owing to the presence of
anisotropy barriers. The Co chains are characterized by large
localized orbital moments and correspondingly large magnetic
anisotropy energies compared to two-dimensional films and bulk
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Ecole Polytech Fed Lausanne, Inst Phys Nanostruct, CH-1015 Lausanne, Switzerland
; KFA Julich GmbH, Forschungszentrum, Inst Festkorperphys, D-52425 Julich, Germany
; Berliner Elektronenspeicherring Gesell Synchrotro, D-12489 Berlin, Germany
; Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
; CNR, Ist Struttura Mat, I-34012 Trieste, Italy
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