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      On the importance of the magnetic dipole term Tzin analyzing X-ray magnetic circular dichroism spectra of clusters

      , ,
      EPL (Europhysics Letters)
      IOP Publishing

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          Ferromagnetism in one-dimensional monatomic metal chains.

          Two-dimensional systems, such as ultrathin epitaxial films and superlattices, display magnetic properties distinct from bulk materials. A challenging aim of current research in magnetism is to explore structures of still lower dimensionality. As the dimensionality of a physical system is reduced, magnetic ordering tends to decrease as fluctuations become relatively more important. 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. 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.
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            Limitation of the magnetic-circular-dichroism spin sum rule for transition metals and importance of the magnetic dipole term.

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              Induced spin polarization in Cu spacer layers in Co/Cu multilayers.

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                Author and article information

                Journal
                EPL (Europhysics Letters)
                Europhys. Lett.
                IOP Publishing
                0295-5075
                1286-4854
                September 01 2009
                September 01 2009
                October 12 2009
                : 87
                : 6
                : 67007
                Article
                10.1209/0295-5075/87/67007
                4213d220-6f85-47a7-8fea-046afaae4df0
                © 2009
                History

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