Magnetic surface nanostructures

Abstract

Recent trends in the emerging field of surface-supported magnetic nanostructures are reviewed. Current strategies for nanostructure synthesis are summarized, followed by a predominantly theoretical description of magnetic phenomena in surface magnetic structures and a review of experimental research in this field. Emphasis is on Fe-or Co-based nanostructures in various low-dimensional geometries, which are studied as model systems to explore the effects of dimensionality, atomic coordination, chemical bonds, alloying and, most importantly, interactions with the supporting substrate on the magnetism. This review also includes a discussion of closely related systems, such as 3d element impurities integrated into organic networks, surface-supported Fe-based molecular magnets, Kondo systems or 4d element nanostructures that exhibit emergent magnetism, thereby bridging the traditional areas of surface science, molecular physics and nanomagnetism.

Self-assembly of strongly dipolar molecules on metal surfaces

“…Both scattering and screening of charge can cause long-range Friedel-type oscillatory interactions between the adsorbates, which can be attractive or repulsive depending on the adsorbate spacing. 40,41 Earlier studies have already demonstrated that metallic substrates can indeed mediate long-range interactions and influence atomic and molecular ordering. Examples include shells of atoms, 41 zwitterionic nano gratings, 42 the self-aligned atomic strings in bimolecular gratings, 43 and porous networks of anthraquinone molecules.…”

“…44 Reported energies for substratemediated interactions are of the order of one or more milli electron volts over a distance of a few nanometers (see overview in Ref. 40 and references therein) so that the resulting structures are typically observed at low temperatures.…”

Temperature Dependence of Metal–Organic Heteroepitaxy

“…The growing aggregates can thus be shaped by selective activation/freezing of certain diffusion processes via the temperature. 1,2,6 There are good reasons that these established principles for metal heteroepitaxy may not be applicable to the heteroepitaxy of organics on metal surfaces. Unlike many metal adsorbates, organic molecules are closed-shell systems with energy gaps across the Fermi energy E F .…”

Spin-1 two-impurity Kondo problem on a lattice

“…Magnetic adatoms can be used to tailor the properties of substrates [1][2][3] and to build nanostructures that could pave the way to magnetic devices with novel functionality including qubits and magnetic memories [4][5][6][7][8][9][10] . Exciting pioneering examples include quantum corrals formed by Fe atoms on Cu(111) 11 , quantum wires on Au(111) surfaces 12 , and more recently, magnetic nanostructures 13 , one dimensional atomic chains 14,15 , and atomic dimers 16 .…”