Heteroepitaxial growth of Co on W(110) investigated by scanning tunneling microscopy

Abstract

We investigated the growth of Co submonolayers on bcc W͑110͒ by scanning tunneling microscopy. Due to the strong Co-W bonding, monolayers of Co grow in equilibrium pseudomorphically on W͑110͒ until the monolayer is almost completed. When excess atoms are deposited atop the pseudomorphic monolayer, it transforms to a close-packed ͑cp͒ monolayer with misfit dislocation lines parallel to ͓11 0͔ ͑Nishiyama-Wassermann orientation͒. The structure of the cp monolayer, as concluded from atomically resolved STM images, deviates from the rigid hard-sphere model of a cp ͑111͒ layer. Details of the structure are compared to a structure model previously proposed by van der Merwe et al. based on the embedded atom model ͑EAM͒.

Magnetic second-harmonic generation from interfaces and nanostructures

“…The different local electronic structure of these interfaces means that they are not exact mirror images of each other and so the phase shift will not produce full cancellation of the response. Further evidence for this A c c e p t e d m a n u s c r i p t -14 -interpretation is that capping this material system with Au is known to increase the coercivity significantly [3], which is consistent with the quite different values obtained for the two regions.…”

“…4 of Ref. [3]). However, in this work the T C value is defined at vanishing remanence, increasing the discrepancy by about 10 K. It is possible that the different capping layer thicknesses account for this difference in T C [33].…”

“…For Fe deposition on °4 This growth mode continues to about 2 ML [28] but, at higher coverage, Stranski-Krastanov growth occurs, with large Fe islands being formed, at least ten atomic layers thick, on a pseudomorphic Fe monolayer [29]. In addition, it is well established that capping such Fe layers with Au at room temperature does not produce any inter-diffusion or reaction [3].…”

Optical reflectance anisotropy of buried Fe nanostructures on vicinal W(110)

“…vicinal W(110) substrates [6][7][8][9][10]. The growth mode of Fe on the vicinal W(110) crystal, offcut by about 1 • towards [100], is well understood.…”

Scanning tunneling spectroscopy of Ni/W(110): bcc and fcc properties in the second atomic layer

“…Here we present STM data of Ni grown at elevated temperatures. This investigation was motivated by the possibility to obtain bcc Ni similar to the case of Co on W(110) which forms a pseudomorphic and a close packed crystallographic structure in the sub-monolayer regime 16 . Bcc Ni has attracted much attention for an expected phase transition from paramagnetic to ferromagnetic depending on the lattice constant [17][18][19] .…”