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Magnetic dipole–dipole interaction.
Notes: (A) Illustration of forces (Fr and Fθ) due to the magnetic dipole–dipole interaction between two magnetic particles and the magnetic force field around a magnetic particle. (B) Normalized trajectories of various size (green color represent 8 μm, red color represent 4 μm, blue represent 2 μm) particle pairs due to magnetic dipole–dipole interaction. Base beads are depicted at the origin.
Abbreviation: H, applied external magnetic field.
