Stabilization of the long-range order within a square dipole lattice by the quadrupole interaction

Klymenko, V. E.; Розенбаум, В. М.; Kukhtin, V.; Shramko, O. V.

doi:10.1016/0038-1098(93)90227-e

Cited by 15 publications

(10 citation statements)

References 9 publications

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“…Hence, in addition to the dipolar interactions also higher order magnetostatic interactions come into play. The few existing calculations of stable multipolar configurations in nano-systems (mainly gas adsorbates) have usually been made within the mean field or Monte-Carlo approach in cartesian coordinates [154,167]. We use spherical coordinates, as this allows a much easier treatment of higher order moments and their interaction energies (see Eq.…”

Section: Higher Order Magnetostatic Contributionsmentioning

confidence: 99%

Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Vedmedenko¹

2007

Physica Status Solidi (b)

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.+ aThe article attempts to analyze the effect of lattice discreteness on the magnetic ordering in nanostructures and nanoarrays. The discussion starts with a basic introduction of the theoretical methods for the description of the magnetic ordering. Next it is shown that the discrete nature of an atomic lattice may lead to the size-driven reorientation of magnetization in nanoparticles, i.e., the magnetization direction can be changed by shrinking the lateral size, keeping the thickness fixed. It is demonstrated that in finite nanomagnets the shape anisotropy can be divided into the discrete and continuum contributions. Then the orientation of magnetic domain walls in low-symmetry objects is discussed. It is shown theoretically that in nanomagnets of monolayer thickness the mechanism of the orientation of domain walls is different from that of bulk systems and is mainly determined by the discreteness of the atomic lattice and the exchange energy. In the last part the theoretical study of magnetostatically interacting nanoarrays is presented. Special attention is paid to the influence of the underlaying lattice symmetry and the higher order multipolar terms on the magnetic ordering. It is demonstrated that the multipole-multipole interactions lead to an enhancement/decrease of the coercivity in arrays with in-plane/out-of-plane magnetization, respectively. In each section of the manuscript the agreement between the theory and recent experimental results is analyzed.

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Section: Higher Order Magnetostatic Contributionsmentioning

confidence: 99%

Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Vedmedenko¹

2007

Physica Status Solidi (b)

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“…22 However, it must be kept in mind that the short range interaction of real dipoles diers from that of ideal ones due to the inuence of higher multipole moments. 21,23,24 For this study, we chose 9-(bis-p-tert-octylphenyl)-amino-perylene-3, 4-dicarboxy anhydride [BOPA-PDCA, chemical formula shown in Fig. 1 d)].…”

Section: Introductionmentioning

confidence: 99%

Monolayer Phases of a Dipolar Perylene Derivative on Au(111) and Surface Potential Build-Up in Multilayers

et al. 2016

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9-(Bis-p-tert-octylphenyl)-amino-perylene-3,4-dicarboxy anhydride (BOPA-PDCA) is a strongly dipolar molecule representing a group of asymmetrically substituted perylenes that are employed in dye-sensitized solar cells and hold great promise for discotic liquid crystal applications. Thin BOPA-PDCA films with orientated dipole moments can potentially be used to tune the energy-level alignment in electronic devices and store information. To help assessing these prospects, we here elucidate the molecular self-assembly and electronic structure of BOPA-PCDA employing room temperature scanning tunneling microscopy and spectroscopy in combination with ultraviolet and X-ray photoelectron spectroscopies. BOPA-PCDA monolayers on Au(111) exclusively form in-plane antiferroelectric phases. The molecular arrangements, the increase of the average number of molecules per unit cell via ripening, and the rearrangement upon manipulation with the STM tip indicate an influence of the dipole moment on the molecular assembly and the rearrangement. A slightly preferred out-of-plane orientation of the molecules in the multilayer induces a surface potential of 1.2 eV. This resembles the giant surface potential effect that was reported for vacuum-deposited tris(8-hydroxyquinoline)aluminum and deemed applicable for data storage. Notably, the surface potential in the case of BOPA-PDCA can in part be reversibly removed by visible light irradiation.

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“…This is a first step in the consideration of the substrate influence on the adsorption processes and the kinetics of adsorbate arrangement on the surface. Anyway, the dipole-dipole interaction is a main input to be used in the problems of surface dipole-lattice structures, which serve as models of adsorbate patterns on various substrates [34,43,[64][65][66][67][68][69][70][71][72].…”

Section: Introductionmentioning

confidence: 99%

Electrostatic charge-charge and dipole-dipole interactions near the surface of a medium with screening non-locality (Review Article)

Gabovich

Войтенко

2016

Low Temperature Physics

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Interaction energy between two point charges, W QQ′ , or two point dipoles, W PP′ , located in a medium with a constant dielectric permittivity near the plane surface of a metallic or semiconducting substrate with the spatial dispersion of its dielectric function has been revisited. The calculations were made on the basis of the Green's function method for layered systems. Long-range lateral asymptotics were found. The non-local character of screening in the substrates was shown to substantially modify the dependences of W QQ′ and W PP′ on the distance between the objects concerned. Thus, the purported conventional electrostatic interactions between adsorbed atoms and molecules (modeled by point charges and point dipoles) should be reconsidered making allowance for the substrate polarization. In particular, this factor may significantly influence the structure of electrostatic dipole lattices arising near the surfaces of solids, as well as the kinetics of charge or dipole motion over the surface.

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Stabilization of the long-range order within a square dipole lattice by the quadrupole interaction

Cited by 15 publications

References 9 publications

Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Influence of the lattice discreteness on magnetic ordering in nanostructures and nanoarrays

Monolayer Phases of a Dipolar Perylene Derivative on Au(111) and Surface Potential Build-Up in Multilayers

Electrostatic charge-charge and dipole-dipole interactions near the surface of a medium with screening non-locality (Review Article)

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