Ferromagnetism in one-dimensional monatomic metal chains.

摘要: 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 still lower dimensionality. As the dimensionality a physical system reduced, ordering tends decrease fluctuations become relatively more important. Spin lattice models predict that an infinite one-dimensional linear chain with short-range interactions spontaneously breaks up into segments different orientation magnetization, thereby prohibiting long-range ferromagnetic order at finite temperature. These models, however, do not take account kinetic barriers reaching equilibrium or substrates support nanostructures. Here we demonstrate existence both short- for monatomic chains Co constructed on Pt substrate. We find evidence consist thermally fluctuating ferromagnetically coupled atoms which, below threshold temperature, evolve long-range-ordered state owing presence anisotropy barriers. The are characterized by large localized orbital moments correspondingly energies compared two-dimensional Co.