Volume 60, Number 3, November I 2002
|Page(s)||418 - 424|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||01 October 2002|
Driven Heisenberg magnets: Nonequilibrium criticality, spatiotemporal chaos and control
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
Accepted: 22 August 2002
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
© EDP Sciences, 2002
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