Evidence of possible band symmetry effects in STM studies of Gd overlayers

Losovyj, Ya. B.; Yakovkin, I.N.; Barrett, Steve; Komesu, Takashi; Dowben, Peter A.

doi:10.1016/s0039-6028(02)01953-2

Cited by 12 publications

(3 citation statements)

References 47 publications

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“…25 The island shape has been attributed to the variation of the step free energy with angle at equilibrium and asymmetric diffusion away from equilibrium, 26 -29 both of which are affected by the asymmetric bonding of adatoms. [30][31][32] The long edges are normally along the fast diffusion directions, though examples of elongated islands and atomic chains perpendicular to the fast diffusion direction have also been observed previously. 31,33 Nevertheless, our results offer another example where the island shape is determined by the symmetry of the substrate.…”

Section: B Fe On Flat Ru"101 1…supporting

confidence: 58%

Self-assembled epitaxial magnetic lateral structures on Ru: Controlling the shape and placement

et al. 2004

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We explore lithographic patterning and substrate orientation of single-crystal Ru substrates as the means to control shape, alignment, and magnetic anisotropy of epitaxial Co and Fe islands. The Co dots and stripes were grown at 350°C via molecular-beam epitaxy and characterized ex situ with atomic force microscopy, magnetic force microscopy, and the magneto-optic Kerr effect. For Co deposited onto a Ru͑0001͒ pre-etched with deep 6ϫ6 m squares, Co islands decorate the edges of the patterns and exhibit in-plane magnetic domains with easy axis along the edges. Shallow patterns, however, do not result in preferential positioning of the dots. When the etched shallow lines are along the close-packed ͓101 0͔ direction, the islands tend to elongate along the induced steps, which introduces a magnetic easy axis along the line direction. In contrast to the quasihexagonal dots of Co on Ru͑0001͒, Fe deposited on the twofold Ru(101 1) forms elongated islands of ϳ100 nm long and 20 nm wide.

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Section: B Fe On Flat Ru"101 1…supporting

confidence: 58%

Self-assembled epitaxial magnetic lateral structures on Ru: Controlling the shape and placement

et al. 2004

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“…[14][15][16] The (110) surface of the body-centeredcubic refractory metals, molybdenum and tungsten, yield a morphology with low corrugation and a resistance to intermixing. Kolaczkiewicz and Bauer 17 and Stenborg et al 18,19 used several laboratory-based techniques to establish the fundamental growth mode and submonolayer structures for Gd and Sm deposited on tungsten and molybdenum.…”

Section: Introductionmentioning

confidence: 99%

Growth of ultrathin rare-earth films studied byin situx-ray diffraction

et al. 2004

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We present in-situ x-ray scattering measurements performed during the growth of two rare-earth metals, gadolinium and samarium, onto molybdenum (110) single crystals. The results have been interpreted using a diffusive growth model to determine the degree of interlayer mass transport in the initial stages of deposition. Both elements are shown to grow generally in a layerwise manner but with significant roughness after the initial layer is complete. A raised substrate temperature modifies the growth; the best Gd single layer is produced at a temperature of 140°C when deposited at a rate of 0.067 monolayers/min while for Sm the growth becomes increasingly islanded at higher temperatures. The presence of oxygen at the surface encourages layer-by-layer growth for both Gd and Sm, although a significant proportion of the atoms are in upper layers before the lower ones are complete. The mechanism for improved layerwise growth is oxide formation at the interface, producing a large amount of small islands that encourage interlayer mass transport. The growth of Sm on Mo (110) is generally more rough than Gd on Mo(110) due to the dynamic size change associated with the coordination induced valence transition for the Sm atoms.

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“…Because the occupied Cu 3d xz and 3d yz are not fully symmetric states, i.e. they are elements in the E irreducible representation, not the fully symmetric A 1 irreducible representation in C 4v , the tunneling matrix elements will be smaller than expected for the Cu 3d z 2 orbital [28][29][30][31][32][33]. Tunneling matrix elements that apply to scanning tunneling microscopy tend to favor the electron states that are fully symmetric: the A 1 irreducible representation in C 4v containing states with s, p z and d z 2 contributions.…”

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confidence: 99%

Changes in the adsorbate dipole layer with changing d-filling of the metal (II) (Co, Ni, Cu) phthalocyanines on Au(111)

Xiao¹,

Dowben²

2008

J. Phys.: Condens. Matter

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In combined photoemission and inverse photoemission spectroscopy studies, we observe changes in the metal phthalocyanine molecular orbital offsets with respect to the conducting gold substrate Fermi level, with the changing d-electron filling of the metal (II) (Co, Ni, Cu) phthalocyanines. The implication is that the interfacial dipole layer depends upon the choice of metal (Co, Ni, Cu) centers within the metal (II) phthalocyanines adsorbed on Au(111).

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Evidence of possible band symmetry effects in STM studies of Gd overlayers

Cited by 12 publications

References 47 publications

Self-assembled epitaxial magnetic lateral structures on Ru: Controlling the shape and placement

Self-assembled epitaxial magnetic lateral structures on Ru: Controlling the shape and placement

Growth of ultrathin rare-earth films studied byin situx-ray diffraction

Changes in the adsorbate dipole layer with changing d-filling of the metal (II) (Co, Ni, Cu) phthalocyanines on Au(111)

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