Visualization and quantification of four steps in magnetic field induced two-dimensional ordering of superparamagnetic submicron particles

Gajula, Gnana Prakash; Neves-Petersen, Maria Teresa; Petersen, Steffen B.
September 2010
Applied Physics Letters;9/6/2010, Vol. 97 Issue 10, p103103
Academic Journal
We hereby report a methodology that permits a quantitative investigation of the temporal self-organization of submicron sized superparamagnetic composite particles in the presence of an external magnetic field. The kinetics of field-induced self-organization into linear chains, time-dependent chain-size distribution, resolved growth steps (condensation, polarization, colinearity, and concatenation), the average chain growth rate, and interparticle interaction length were calculated in the presence of a 120 G external magnetic field using optical microscopy and “in-house” developed image analysis software. The measurements are in good agreement with theoretical assumptions.


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