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| 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. | | Language: | English | | Date of Publication (YYYY-MM-DD): | 2002 | | Title of Journal: | Nature | | Volume: | 416 | | 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
Co. | | 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
| | Identifiers: | ISI:000174482200036
ISSN:0028-0836 | |
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