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Oscillatory curie temperature of two-dimensional ferromagnets
M Pajda1, J Kudrnovský, I Turek
1Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany.
Physical Review Letters
|January 3, 2001
Summary
We calculated magnetic interactions for Fe/Cu(001) and Co/Cu(001) overlayers. Curie temperature oscillations were observed with Cu-cap thickness, matching experimental trends.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- Understanding magnetic properties of thin films is crucial for spintronic devices.
- Fe/Cu(001) and Co/Cu(001) systems are model systems for studying magnetism at interfaces.
Purpose of the Study:
- To calculate effective exchange interactions in Fe/Cu(001) and Co/Cu(001) overlayers capped with copper.
- To investigate the influence of cap layer thickness on magnetic properties like Curie temperature.
Main Methods:
- First-principles calculations in real space.
- Construction of a two-dimensional Heisenberg Hamiltonian.
- Application of mean-field and random-phase approximations.
Main Results:
- Calculated effective exchange interactions for Fe/Cu(001) and Co/Cu(001).
- Estimated magnon dispersion laws and spin-wave stiffness constants.
- Observed oscillatory behavior of the overlayer Curie temperature with varying Cu-cap thickness.
Conclusions:
- The calculated oscillatory Curie temperature qualitatively agrees with experimental observations.
- First-principles methods provide insights into the magnetic behavior of capped thin films.