Classical Solitons in Spin-Chains: Susceptibility as Function of Temperature and Frequency

Abstract

It is shown that relatively simple phenomenological considerations of the motion of thermally activated solitons (kinks of various types) in the single spin chains can explain and describe qualitatively and quantitatively the temperature and frequency behaviour of magnetic susceptibility in ac magnetic fields. The comparison of experimental data and theoretical results allows to estimate the number of solitons and “weak” places in correlation regions of a sample.

Keywords:

• Single chain magnet
• solitons
• magnetic relaxation
• activated reversal of magnetization
• magnetic susceptibility

Acknowledgments

We are thankful to the Division of Physical Sciences of Russian Academy of Sciences (program 5.1 b “New Materials and Structures”), and to the Russian Foundation for Basic Research (project no. 05-02-16871) for the support. S.A. Pikin acknowledges the Alexander von Humboldt Foundation for the support and possibility of working in the Darmstadt University of Technology. W.H. acknowledges the support of the Deutsche Forschungsgemeinschaft.

This paper was written specially for Ferroelectrics Vol. 354, devoted to Nobel Laureate Professor Vitaly L. Ginzburg, in celebration of his 90th birthday.