Free Energy of the Amorphous Ferromagnets with Heisenberg Exchange Interaction and Liquid-Like Disorder

✍ Scribed by I. A. Vakarchuk; Yu. K. Rudavskii; G. V. Ponedilok

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 607 KB
• Volume: 128
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/pssb.2221280128

✦ Synopsis

Abstract

A continuous integration method is used for the investigation of the Heisenberg quantum model with structure disorder. The free energy of such system is obtained as the perturbation theory series of the inverse cube of effective exchange interaction radius for arbitrary temperature and spin value. The contribution of magnetic and structure fluctuation effects to the thermodynamics, magnetization of the system, and temperature of the ferromagnetic phase transition is investigated. Numerical calculations on the base of model systems show that the change of critical temperature and low temperature magnetization at the amorphization of a crystal are in qualitative agreement with experimental results.