Dynamics of point dislocations along glide lines in two-dimensional colloidal crystal

We have developed an experimental model to study the growth and healing of crystalline domains in a monolayer of paramagnetic particles exposed to a high-frequency rotating magnetic field. Here, our goal is to measure the stress/strain relationships of point dislocations that move along glide lines during the crystal healing process. These measurements are based on a combination of image processing to determine the local strain and force calculations to determine the local stress based on our prior calibration of the pairwise interaction potential. We will present measurements on both the elastic modulus and the yield stress as the point dislocation moves from the interior of the crystal towards a domain boundary. These measurements are conducted in different applied magnetic fields strengths in order to model the crystal healing properties at different temperatures. We also quantify the net torque and rotation of the domain as the point dislocation moves along a glide line, which allows the domain boundaries between neighboring crystals to heal.