- PII
- 10.31857/S004445102412006X-1
- DOI
- 10.31857/S004445102412006X
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 166 / Issue number 6
- Pages
- 822-833
- Abstract
- To explain the features of magnetic phase transitions in FeRh alloy, an effective mean-field theory is proposed that takes into account the interaction of elastic and magnetic degrees of freedom. Along with the magnetization of iron atom sublattices and mean values of the uniform compression deformation and uniaxial tension strains, the order parameter of the theory also includes internal magnetic field causing the appearance of non-zero magnetization of rhodium atoms during the antiferro-ferromagnetic phase transition. Within this theory, it is possible to calculate the temperature dependencies of total magnetization and relative volume change that agree with experimental data, and to show that the antiferro-ferromagnetic transition is a first-order phase transition. The choice of exchange interaction constants, consistent with ab initio calculations of electronic structure, reveals the leading mechanism of this transition — the renormalization of exchange interaction between nearest neighbors in the iron atom subsystem, arising when considering two-ion magnetoelastic interaction. It is shown that thermal excitation of spin waves contributes to the enhancement of uniaxial strains, reducing the cubic symmetry of the lattice to tetragonal.
- Keywords
- Date of publication
- 15.12.2024
- Year of publication
- 2024
- Number of purchasers
- 0
- Views
- 33
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