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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Speciation and Bioavailability Measurements of Environmental Plutonium Using Diffusion in Thin Films
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Published on: November 9, 2015

Surface modifications by field induced diffusion.

Martin Olsen1, Magnus Hummelgård, Håkan Olin

  • 1Department of Natural Sciences, Engineering and Mathematics, Mid Sweden University, Sundsvall, Sweden. Martin.Olsen@miun.se

Plos One
|January 19, 2012
PubMed
Summary
This summary is machine-generated.

Applying voltage pulses to a scanning tunneling microscope tip induces surface modification. This study models electric field-induced adatom diffusion, revealing a polarity-dependent threshold voltage for mound formation and the significant role of van der Waals forces.

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Area of Science:

  • Surface science
  • Atomic force microscopy
  • Condensed matter physics

Background:

  • Scanning tunneling microscopy (STM) enables atomic-scale surface manipulation.
  • Electric fields can induce surface diffusion of adatoms.
  • Van der Waals forces influence atomic interactions at surfaces.

Purpose of the Study:

  • To investigate electric field-induced surface diffusion of adatoms.
  • To model mound formation on surfaces, including van der Waals forces.
  • To derive a formula for threshold voltage in mound formation.

Main Methods:

  • Analytical modeling of electric field-induced forces on adatoms.
  • Calculation of adatom migration forces considering dipole moments and van der Waals interactions.
  • Modeling the electric field using a point charge over a conducting surface.

Main Results:

  • A novel formula for polarity-dependent threshold voltage for mound formation was derived.
  • A threshold electric field of approximately 2 V/nm for mound formation was calculated.
  • Van der Waals forces are significant at distances <1.5 nm, influencing radial forces on adatoms.

Conclusions:

  • Electric field-induced surface diffusion is a viable mechanism for surface modification.
  • Van der Waals forces play a crucial role in mound formation at short adatom-surface distances.
  • The developed model provides a method to predict mound formation and radius based on applied voltage pulses.