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Atomistic modelling of Atom Probe Tomography

Atomistic modelling of Atom Probe Tomography. From Stefan Parviainen’s Presentation Helsinki Institute of Physics. How does APT Work ?. To cause controlled evaporation either : Apply an electric field Illuminate the tip with a laser. To obtain the 3D model : algorythm

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Atomistic modelling of Atom Probe Tomography

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  1. Atomisticmodelling of AtomProbeTomography From Stefan Parviainen’sPresentation Helsinki Institute of Physics

  2. Howdoes APT Work? To cause controlled evaporationeither: • Applyanelectricfield • Illuminatethetipwith a laser Toobtainthe 3D model: algorythm • x,yfrom simple projection • z fromevaporationorder J. Appl. Phys. 105, 034913 Germaniumnanowires, Physorg.com S. Parviainen, Helsinki Institute of PhysicsRF Meeting 3rd August 2011 Rocío Santiago Kern

  3. ED+MD Model • Usedfor DC simulations, can bealsousedaftersome “corrections” for APT • Differentelectricfieldpolarity • APT at lowtemperature (~70k) • MD Model: • Easytosimulatedifferentmaterials (Cu, Fe) and geometricalshapes • Inter-atomicpotentialsgiveenergyneededtoremoveatoms S. Parviainen, Helsinki Institute of PhysicsRF Meeting 3rd August 2011 Rocío Santiago Kern

  4. Simulations Top Side PlanarVoids Cu with Fe precipitate Animationsnotavailable (sorry) S. Parviainen, Helsinki Institute of PhysicsRF Meeting 3rd August 2011 Rocío Santiago Kern

  5. Otherapplications Willbetestedwiththe DC-SparkSystem S. Parviainen, MeVArc 2011 Evaporationcouldbeused as surfacetreatment: • Getrid of theemitters (doesnotworkiftheygrow back quickly) • No Fieldemission Higherbreakdownfield S. Parviainen, Helsinki Institute of PhysicsRF Meeting 3rd August 2011 Rocío Santiago Kern

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