Growth of Co on Au(111) studied by multiwavelength anomalous grazing-incidence small-angle x-ray scattering: From ordered nanostructures to percolated thin films and nanopillars

The growth of Co on Au(111) has been investigated in situ in ultrahigh vacuum by grazing-incidence small-angle x-ray scattering (GISAXS) and grazing-incidence x-ray diffraction (GIXD). Three different growth scenarios have been investigated. (i) In the submonolayer regime, the shape, size, and spatial organization of the Co dot network have been studied, thanks to a three-dimensional mapping of the reciprocal space around the reciprocal space origin. (ii) At the coalescence of the nanostructures and beyond, it is shown by multiwavelength anomalous GISAXS and GIXD that the percolated Co thin film is made of a bidimensional network of grain boundaries. This reveals that the Co atomic diffusion at room temperature is unable to heal defects. (iii) The Co nanopillars have been grown by sequential deposition of Co and Au following the approach proposed by Fruchart et al. [Phys. Rev. Lett. 83, 2769 (1999)]; the mapping of the reciprocal space in the small-angle regime by GISAXS unambiguously proves that the nanopillars are ordered.

[1]  Harald Ibach,et al.  The role of surface stress in reconstruction, epitaxial growth and stabilization of mesoscopic structures , 1997 .

[2]  Sirota,et al.  X-ray and neutron scattering from rough surfaces. , 1988, Physical review. B, Condensed matter.

[3]  A. Barbier,et al.  A new UHV diffractometer for surface structure and real time molecular beam deposition studies with synchrotron radiations at ESRF , 1999 .

[4]  Ignaz Eisele,et al.  Grazing incidence small angle x-ray scattering from free-standing nanostructures , 1999 .

[5]  R. Lazzari,et al.  IsGISAXS: a program for grazing‐incidence small‐angle X‐ray scattering analysis of supported islands , 2002 .

[6]  H. Bulou,et al.  Local strain analysis of the herringbone reconstruction of Au(111) through atomistic simulations , 2002 .

[7]  V. Repain,et al.  Two-dimensional long-range?ordered growth of uniform cobalt nanostructures on a Au(111) vicinal template , 2002 .

[8]  J. Bucher,et al.  TRANSITION FROM ZERO-DIMENSIONAL SUPERPARAMAGNETISM TO TWO-DIMENSIONAL FERROMAGNETISM OF CO CLUSTERS ON AU(111) , 1999 .

[9]  Spohn,et al.  Small-angle x-ray scattering under grazing incidence: The cross section in the distorted-wave Born approximation. , 1995, Physical review. B, Condensed matter.

[10]  A. Barbier,et al.  Structure and morphology of the Ag/MgO(001) interface during in situ growth at room temperature , 1999 .

[11]  R. Belkhou,et al.  Structure and local order in Co magnetic thin films on Au(111): A surface EXAFS study , 1999 .

[12]  Marcella Giovannini,et al.  Self-organized growth of nanostructure arrays on strain-relief patterns , 1998, Nature.

[13]  Meyer,et al.  Epitaxial growth of thin magnetic cobalt films on Au(111) studied by scanning tunneling microscopy. , 1991, Physical review. B, Condensed matter.

[14]  H. Brune.  Microscopic view of epitaxial metal growth: nucleation and aggregation , 1998 .

[15]  Luc Favre,et al.  Magnetic and structural properties of isolated and assembled clusters , 2005 .

[16]  Jacques Jupille,et al.  Real-Time Monitoring of Growing Nanoparticles , 2003, Science.

[17]  Sun,et al.  Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices , 2000, Science.

[18]  Kobayashi,et al.  Vertically self-organized InAs quantum box islands on GaAs(100). , 1995, Physical review letters.

[19]  G. Renaud,et al.  Apparatus for real time in situ quantitative studies of growing nanoparticles by grazing incidence small angle X-ray scattering and surface differential reflectance spectroscopy , 2004 .

[20]  J. Kirschner,et al.  Self-Organized Growth of Nanosized Vertical Magnetic Co Pillars on Au(111) , 1999 .

[21]  V. Repain,et al.  Ordered growth of cobalt nanostructures on a Au(111) vicinal surface: nucleation mechanisms and temperature behavior , 2002 .

[22]  Claude R. Henry,et al.  Quantitative analysis of grazing incidence small-angle x-ray scattering: Pd/MgO(001) growth , 2004 .

[23]  K. Kern,et al.  Ferromagnetism in one-dimensional monatomic metal chains , 2002, Nature.

[24]  J. Toennies,et al.  Observation of a soliton reconstruction of Au(111) by high-resolution helium-atom diffraction. , 1985, Physical review letters.

[25]  E. Kramer,et al.  Single-crystal diffraction from two-dimensional block copolymer arrays. , 2007, Physical review letters.

[26]  A. Barbier,et al.  X-ray super-cell crystallography of self-organized Co/Au(111) deposits , 2003 .

[27]  G. Renaud,et al.  X-ray scattering from stepped and kinked surfaces: An approach with the paracrystal model , 2007, 0707.3381.

[28]  Y. Girard,et al.  Measuring surface stress discontinuities in self-organized systems with X rays. , 2002, Physical review letters.

[29]  A. Saúl,et al.  Elastic effects on surface physics , 2004 .

[30]  Ertl,et al.  Scanning tunneling microscopy observations on the reconstructed Au(111) surface: Atomic structure, long-range superstructure, rotational domains, and surface defects. , 1990, Physical review. B, Condensed matter.

[31]  Huang,et al.  Structure and phases of the Au(111) surface: X-ray-scattering measurements. , 1991, Physical review. B, Condensed matter.

[32]  J. Kollár,et al.  The surface energy of metals , 1998 .

[33]  Self-organized growth of nanoparticles on a surface patterned by a buried dislocation network. , 2005, Physical review letters.

[34]  R. H. Pratt,et al.  The validity of form-factor, modified-form-factor and anomalous-scattering-factor approximations in elastic scattering calculations , 1995 .

[35]  T. Metzger,et al.  Determination of strain fields and composition of self-organized quantum dots using x-ray diffraction , 2001 .

[36]  E. Vlieg,et al.  The effect of Sb on the nucleation and growth of Ag on Ag(100) , 1995 .

[37]  T. Cren,et al.  Uniform magnetic properties for an ultrahigh-density lattice of noninteracting co nanostructures. , 2005, Physical review letters.

[38]  Schuller,et al.  Structural refinement of superlattices from x-ray diffraction. , 1992, Physical review. B, Condensed matter.

[39]  P. Steadman,et al.  Determination of the elastic dipole at the atomic steps of Pt(977) from surface x-ray diffraction , 2003 .

[40]  G. Renaud,et al.  Kink ordering and organized growth of Co clusters on a stepped Au(111) surface: A combined grazing-incidence x-ray scattering and STM study , 2008 .