SphericallyBluntedConicTip

The SphericallyBluntedConicTip potential models an AFM tip as a conic structure with a spherical end. This geometry is often used to represent real AFM tips more accurately than simple spherical models.

The potential includes: 1. Tip-sample interaction: A repulsive potential between the tip and sample particles. 2. Tip-chip interaction: A harmonic potential representing the cantilever.

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• type: AFM, SphericallyBluntedConicTip

• parameters: * sigma: real: Interaction range parameter \([distance]\) * epsilon: real: Interaction strength parameter \([energy]\) * K: real: Vertical spring constant of the cantilever \([energy/distance^2]\) * Kxy: real: Lateral spring constant of the cantilever \([energy/distance^2]\) * tipAngle: real: Half-angle of the conical part of the tip \([angle]\) * tipVelocity: real: Velocity of the tip in the z-direction \([distance/time]\) * startChipPosition: real3: Initial position of the chip (cantilever base) \([distance]\)

Example:

"afmTip":{
  "type":["AFM","SphericallyBluntedConicTip"],
  "parameters":{
    "sigma": 0.1,
    "epsilon": 100.0,
    "K": 10.0,
    "Kxy": 1.0,
    "tipAngle": 0.261799, // 15 degrees in radians
    "tipVelocity": 0.1,
    "startChipPosition": [0.0, 0.0, 20.0]
  }
}

Note

This potential is particularly useful for modeling AFM tips with a more realistic geometry, allowing for accurate simulation of both normal and lateral forces during AFM experiments.

Warning

The tip angle should be specified in radians. Ensure that the tip velocity and start position are consistent with your simulation time and length scales.