Observation of strong surface state effects in the nonlinear magneto-optical response of Ni(110)

Spectroscopic magnetization induced optical Second Harmonic Generation (MSHG) measurements from a clean Ni(110) surface reveal strong resonance effects near 2.7 eV that can be attributed to the presence of an empty surface state. The good agreement with model calculations shows the potential of MSHG to probe spin polarized interface band structures.Comment: REVTeX/EPS figures/Authors's single Postsript file, to appear in PRL, our new phase-sensitive detection technique is used (see PRB, 58, R16020 (1998)), for more details see http://www.sci.kun.nl/tvs/people/petukhov

Transition from tunneling to direct contact in tungsten nanojunctions

We apply the mechanically controllable break junctions technique to investigate the transition from tunneling to direct contact in tungsten. This transition is quite different from that of other metals and is determined by the local electronic properties of the tungsten surface and the relief of the electrodes at the point of their closest proximity. The conductance traces show a rich variety of patterns from the avalanche-like jump to a mesoscopic contact to the completely smooth transition between direct contact and tunneling. Due to the occasional absence of an adhesive jump the conductance of the contact can be continuously monitored at ultra-small electrode separations. The conductance histograms of tungsten are either featureless or show two distinct peaks related to the sequential opening of spatially separated groups of conductance channels. The role of surface states of tungsten and their contribution to the junction conductance at sub-Angstrom electrode separations are discussed.Comment: 6 pages, 6 figure

Laser-focused nanofabrication: Beating of two atomic resonances

Contains fulltext : 92604.pdf (publisher's version ) (Open Access

Deposition of magnetic nanostructures of atomic lithography: Semiclassical simulation

Contains fulltext : 92670.pdf (publisher's version ) (Open Access

Laser manipulation of iron for nanofabrication

Contains fulltext : 57617.pdf (publisher's version ) (Open Access)We fabricate iron nanolines by depositing an atomic beam of iron through a far-off resonant laser standing wave (SW) onto a glass-ceramic substrate. The laser SW is tuned 200 MHz above the D-5(4)-->F-5(5)o Fe-56 transition at a vacuum wavelength of 372.099 nm. The resulting nanolines exhibit a period of 186 nm, a height above the background of 8 nm and a full width at half maximum of 95 nm. These nanostructures cover a surface area of similar or equal to1.6x0.4 mm(2), corresponding to similar or equal to8600 iron lines with a length of similar or equal to400 mum. (C) 2004 American Institute of Physics

Strong self- and cross-phase modulation effects in chromium-doped KTiOPO4 crystals

Contains fulltext : 92631.pdf (publisher's version ) (Closed access