  It is well-known that magnetic forces can induce a formation of densely
packed strings of magnetic particles or even sheafs of several strings
(spindles). Here we show that in a sufficiently strong magnetic field, more
complex aggregates of particles, translating with a much faster speed than
would be for a single particle or even a spindle, can be assembled at the
water-air interface. Such a superfast flotilla is composed of many distant
strings or spindles, playing a role of its vessels, and moves, practically, as
a whole. We provide theoretical results to interpret the effect of a collective
motion of such magnetic vessels. Our theory shows that, in contrast to an
isolated chain or spindle, which velocity grows logarithmically with the number
of magnetic particles, the speed of the interface flotilla becomes much higher,
being proportional to the square root of their number. These results may guide
the design of magnetic systems for extremely fast controlled delivery.
