Chaotic dynamics and spin correlation functions in a chain of nanomagnets

Details Chaotic dynamics and spin correlation functions in a chain of nanomagnets Chaotic dynamics and spin correlation functions in a chain of nanomagnets

2011-04-03

arxiv.org/abs/1104.0371v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Phys.Rev.B

Scientific paper

We study a chain of coupled nanomagnets in a classical approximation. We show that the infinitely long chain of coupled nanomagnets can be equivalently mapped onto an effective one-dimensional Hamiltonian with a fictitious time-dependent perturbation. We establish a connection between the dynamical characteristics of the classical system and spin correlation time. The decay rate for the spin correlation functions turns out to depend logarithmically on the maximal Lyapunov exponent. Furthermore, we discuss the non-trivial role of the exchange anisotropy within the chain.

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