Self-Assembly of Superparamagnets: Review

Predicting the Self-Assembly of Superparamagnetic Colloids under Magnetic Fields.
Jordi Faraudo, Jordi S. Andreu, Carles Calero and Juan Camacho

Adv. Funct Materials 22, 3837 (2016)

a) Motion of colloids in a chain in an LD simulation; b) effective ellipsoid representing a chain of s colloids, which has anisotropic diffusion with different coefficients in the parallel and perpendicular directions. c) Map of magnetic potential energy of interaction between an imaginary colloid and a chain of five particles, all magnetized in the z-direction. The calculation corresponds to Γ = 40 and the magnetic energy is measured in units of k_BT. The dashed line indicates the regions at which the magnetic energy is equal (in absolute value) to the thermal energy. d) Coarse grain representation of the chain in panel (c) as employed in MagChain simulations in which the attractive region inside the dashed lines in panel (c) is replaced by a spherical region.