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3860240 
Journal Article 
Memory formation and evolution of the vortex configuration associated with random organization 
Dobroka, M; Kawamura, Y; Ienaga, K; Kaneko, S; Okuma, S 
2017 
1 
New Journal of Physics
ISSN: 1367-2630 
IOP PUBLISHING LTD 
BRISTOL 
19 
5 
053023 
English 
WOS:000402532100009 
We study the general phenomenon of random organization using a vortex system. When a periodic shear with a small shear amplitude d(inp) is applied to many-particle (vortex) assemblies with a random distribution, the particles (vortices) gradually self-organize to avoid future collisions and transform into an organized configuration. This is detected from the time-evolution of the voltage V (t) (average velocity) that increases towards a steady-state value. From the subsequent readout measurements of V (t) using various shear amplitudes, we find that the information of the input shear amplitude dinp is memorized in the configuration of the vortex distributions in the transient as well as the steady state, and that it is readable. We also find that the transient vortex configuration formed during random organization is not microscopically homogeneous but consists of disordered and organized regions. 
vortex dynamics; self-organized systems; nonequilibrium phase transition; pinning; memory effect; reversible to irreversible flow transition; many-particle systems 
IRIS
• Diisononyl Phthalate (DINP)
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