Surface diffusion and growth of patterned nanostructures on strained surfaces

We propose a method of controllable growth of patterned nanostructures on a surface with a sell-organized network of buried dislocations. The general treatment for the diffusion of Co adatoms and growth on the strained Ptsurface is given as a prototype for magnetic recording media. Ab initio self-consistent calculations of surface diffusion events of a Co adatom on the Pt( 111) surface show that adatoms prefer to diffuse to the regions of largest tensile strain. The hopping barrier for adatom diffusion increases with tensile strain showing that preferred nucleation occurs in the regions of high tensile stress. The variation of the hopping barrier on the underlying strain produced by buried dislocations is analyzed in terms of a surface stress relief picture based on ah initio calculations. Based on these results, kinetic Monte Carlo studies of the growth of Co on Pt(111) have been performed; they show the possibility of controlled growth of patterned nanostructures with appropriate choice of dislocation spacing, film thickness and temperature.

[1]  M. Larsson.  Kinetic Monte Carlo simulations of adatom island decay on Cu(111) , 2001 .

[2]  M. Scheffler,et al.  Effect of strain on surface diffusion in semiconductor heteroepitaxy , 2001, cond-mat/0105397.

[3]  Bernard Rodmacq,et al.  Magnetic properties of Co/Pt multilayers deposited on silicon dot arrays , 2000 .

[4]  E. Lundgren,et al.  Thin films of Co on Pt(111): Strain relaxation and growth , 2000 .

[5]  W. Hübner,et al.  Surface stress and relaxation in metals , 2000 .

[6]  M. Giovannini,et al.  Self-organized growth of cluster arrays , 1999 .

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

[8]  Dieter Bimberg,et al.  Spontaneous ordering of nanostructures on crystal surfaces , 1999 .

[9]  P. Feibelman.  Self-diffusion along step bottoms on Pt(111) , 1999 .

[10]  G. Kresse,et al.  From ultrasoft pseudopotentials to the projector augmented-wave method , 1999 .

[11]  T. Ala‐Nissila,et al.  Effect of kinks and concerted diffusion mechanisms on mass transport and growth on stepped metal surfaces , 1997 .

[12]  M. Scheffler,et al.  Strain dependence of surface diffusion: Ag on Ag(111) and Pt(111) , 1997, cond-mat/9702025.

[13]  D. Srolovitz,et al.  ADATOM-STEP INTERACTIONS : ATOMISTIC SIMULATIONS AND ELASTIC MODELS , 1997 .

[14]  G. Kresse,et al.  Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set , 1996 .

[15]  Srolovitz,et al.  Elastic field of a surface step: Atomistic simulations and anisotropic elastic theory. , 1996, Physical review. B, Condensed matter.

[16]  Kern,et al.  Effect of strain on surface diffusion and nucleation. , 1995, Physical review. B, Condensed matter.

[17]  Blöchl,et al.  Projector augmented-wave method. , 1994, Physical review. B, Condensed matter.

[18]  Kieffer.  Mechanical degradation and viscous dissipation in B2O3. , 1994, Physical review. B, Condensed matter.

[19]  Wolf.  Should all surfaces be reconstructed? , 1993, Physical review letters.

[20]  L. Freund.  The Mechanics of Dislocations in Strained-Layer Semiconductor Materials , 1993 .

[21]  P. Feibelman,et al.  Diffusion path for an Al adatom on Al(001). , 1990, Physical review letters.

[22]  Kellogg,et al.  Surface self-diffusion on Pt(001) by an atomic exchange mechanism. , 1990, Physical review letters.

[23]  P. Dederichs,et al.  Anisotropic diffusion in stress fields , 1978 .

[24]  H. Monkhorst,et al.  SPECIAL POINTS FOR BRILLOUIN-ZONE INTEGRATIONS , 1976 .

[25]  D. Lazarus,et al.  Calculating Activation Volumes and Activation Energies from Diffusion Measurements , 1970 .

[26]  R Shuttleworth,et al.  The Surface Tension of Solids , 1950 .