Field history analysis of spin configurations in the random-field Ising model

✍ Scribed by Vittorio Basso; Alessandro Magni

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 238 KB
• Volume: 343
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2003.08.106

✦ Synopsis

We introduce a method for the analysis of spin configurations of Ising-type models exhibiting the return point memory. We define a function fH S g ¼ gðs H Þ which allows, starting from a spin configuration s H produced by the application of a field history from saturation state, to obtain the set of reversal fields fH S g which are actually stored in the state and that-if applied as a field history-will reproduce the original state. This function allows to discriminate if a locally stable state can be reached by the application of an external field. This method is applied to the numerical study of 1D random-field Ising model showing that there exists a correlation between low-energy and field-reachable configurations and indicating the possibility of determining the size of the set of the field-reachable states.