Abstract
An array of magnetic-particle chains is assembled and aligned in a magnetic field H, and its structures are studied by small-angle light scattering. The system undergoes a series of structural changes: single particles \ensuremath{\rightarrow} disordered anisotropical domains \ensuremath{\rightarrow} array of strongly correlated columns, as H increases. Different structure regions are separated by two critical field lines ${\mathit{H}}_{\mathit{C}1}$(\ensuremath{\varphi}) and ${\mathit{H}}_{\mathit{C}2}$(\ensuremath{\varphi}), where \ensuremath{\varphi} is the concentration of the particles. Due to disorders inherited in the self-assembling process, the magnetic columns remain short-range ordered even in the strong-field limit, H\ensuremath{\gg}${\mathit{H}}_{\mathit{C}2}$.
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