Krasny, Yu. P. and Kovalenko, N. P. and Krey, Uwe (1997) Thermodynamics of amorphous magnets with ferromagnetic and antiferromagnetic coupling. PHYSICA B-CONDENSED MATTER, 240 (1-2). pp. 173-182. ISSN 0921-4526, 1873-2135
Full text not available from this repository.Abstract
Two-component amorphous magnetic alloys are considered, with ferromagnetic coupling between atoms of the same subsystem, but antiferromagnetic coupling between atoms belonging to different subsystems. It is shown that in such systems a complete magnetic moment compensation at finite temperatures is impossible, except globally at certain compensation points. As a consequence, a crystalline antiferromagnetic alloy generically goes ferrimagnetic upon amorphization. The qualitative behaviour of the averaged spontaneous magnetization is investigated throughout the entire temperature range, in a mean-field approximation near the critical temperature, and in a random-phase approximation at low temperatures. The structural properties of the system are taken into account through certain correlation functions of the positions of the atoms. It is shown that in a magnetic alloy the temperature dependence of the magnetic moment depends essentially on the concentration of the components, and on certain effective exchange parameters. Depending on these parameters, there can be 0, 1, or 2 compensation points, and the concentration-dependence of the ordering temperature Theta(N) can be linear, concave, convex or ''mixed concave-convex''.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TEMPERATURE; SYSTEM; amorphous magnetic materials; antiferromagnetics; ferrimagnetic |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Mar 2023 07:46 |
| Last Modified: | 30 Mar 2023 07:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50629 |
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