Research Papers in Physics and Astronomy

 

Date of this Version

June 2001

Comments

Published by American Institute of Physics. J. Applied Physics Volume 89, Issue 11, pp. 7036-7038. ©2001 American Institute of Physics. Permission to use. http://jap.aip.org/jap/.

Abstract

Relaxation processes in disordered nanostructures and spin glasses are investigated by examining the role of the magnetic anisotropy. To abstract from freezing processes associated with phase transitions, the consideration is restricted to a one-dimensional bond-disordered Ising spin glass. Using a Mattis-type gauge transformation, the spin glass is mapped onto a disordered ferromagnet. Based on the behavior of the spin chain we argue that spin-glass freezing is not necessarily related to a phase transition. The magnetic anisotropy, which is largely ignored in the Glauber approach to Ising dynamics, gives rise to cooperative deviations from the Arrhenius behavior and mimics Vogel–Fulcher relaxation. ©2001 American Institute of Physics.



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