Issue Europhys. Lett. Volume 60, Number 3, November 2002 Page(s) 418 - 424 Section   Condensed matter: structural, mechanical and thermal properties DOI 10.1209/epl/i2002-00280-2

DOI: 10.1209/epl/i2002-00280-2


Europhys. Lett., 60 (3) , pp. 418-424 (2002)

Driven Heisenberg magnets: Nonequilibrium criticality, spatiotemporal chaos and control

J. Das^{1, 2}, M. Rao¹ and S. Ramaswamy<sup>3

1</sup>  Raman Research Institute - C.V. Raman Avenue Sadashivanagar, Bangalore 560080, India
²  Institute of Mathematical Sciences - Taramani, Chennai 600113, India
³  Centre for Condensed-Matter Theory, Department of Physics Indian Institute of Science - Bangalore 560 080, India

jayajit@vt.edu
madan@rri.res.in
sriram@physics.iisc.ernet.in

(Received 12 April 2002; accepted in final form 22 August 2002)

Abstract
We drive a d-dimensional Heisenberg magnet using an anisotropic current. The continuum Langevin equation is analysed using a dynamical renormalization group and numerical simulations. We discover a rich steady-state phase diagram, including a critical point in a new nonequilibrium universality class, and a spatiotemporally chaotic phase. The latter may be "controlled" in a robust manner to target spatially periodic steady states with helical order.

PACS
64.60.Cn - Order-disorder transformations; statistical mechanics of model systems.
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.


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