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Dynamical configurations and bistability of helical nanostructures under external torque

Ghosh, Arijit and Paria, Debadrita and Singh, Haobijam Johnson and Venugopalan, Pooyath Lekshmy and Ghosh, Ambarish (2012) Dynamical configurations and bistability of helical nanostructures under external torque. In: Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 86 (3, Par).

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Official URL: http://dx.doi.org/10.1103/PhysRevE.86.031401

Abstract

We study the motion of a ferromagnetic helical nanostructure under the action of a rotating magnetic field. A variety of dynamical configurations were observed that depended strongly on the direction of magnetization and the geometrical parameters, which were also confirmed by a theoretical model, based on the dynamics of a rigid body under Stokes flow. Although motion at low Reynolds numbers is typically deterministic, under certain experimental conditions the nanostructures showed a surprising bistable behavior, such that the dynamics switched randomly between two configurations, possibly induced by thermal fluctuations. The experimental observations and the theoretical results presented in this paper are general enough to be applicable to any system of ellipsoidal symmetry under external force or torque.

Item Type: Journal Article
Additional Information: Copyright for this article is belongs to The American Physical Society.
Keywords: CONTROLLED PROPULSION;SWIMMING PROPERTIES;MICRO-MACHINE; PRINCIPLES;NANOMOTORS;BACTERIA;MOTION;CARGO
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Other Centres/Units > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 03 Dec 2012 08:03
Last Modified: 03 Dec 2012 08:03
URI: http://eprints.iisc.ernet.in/id/eprint/45197

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