Avalanches in complex spin networks

Details Avalanches in complex spin networks Avalanches in complex spin networks

2005-03-31

arxiv.org/abs/cond-mat/0503760v3

Physica A373C (2007) 785

Physics

Condensed Matter

Disordered Systems and Neural Networks

16 pages, 10 figures in 29 eps files

Scientific paper

10.1016/j.physa.2006.04.117

We investigate the magnetization reversal processes on classes of complex spin networks with antiferromagnetic interaction along the network links. With slow field ramping the hysteresis loop and avalanches of spin flips occur due to topological inhomogeneity of the network, even without any disorder of the magnetic interaction [B. Tadic, et al., Phys. Rev. Lett. 94 (2005) 137204]. Here we study in detail properties of the magnetization avalanches, hysteresis curves and density of domain walls and show how they can be related to the structural inhomogeneity of the network. The probability distribution of the avalanche size, N_s(s), displays the power-law behaviour for small s, i.e. N_s(s)\propto s^{-\alpha}. For the scale-free networks, grown with preferential attachment, \alpha increases with the connectivity parameter M from 1.38 for M=1 (trees) to 1.52 for M=25. For the exponential networks, \alpha is close to 1.0 in the whole range of M.

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