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Ab initio study of the magnetic ordering in Si/Mn digital alloys
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- Autor/in:
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- Otrokov, M. M.
- Ernst, Arthur
- Tugushev, V. V.
- Ostanin, Sergey
- Buczek, Pawel
- Sandratskii, Leonid M.
- Fischer, G.
Hergert, W. Mertig, Ingrid Kuznetsov, V. M. Chulkov, E. V. - Zeige mehr (+4)…
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- Verlag/Körperschaft:
- American Physical Society
- Erscheinungsjahr:
- 2011
- Medientyp:
- Text
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- Beschreibung:
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- We present a first-principles study of the electronic structure and exchange interactions in Si/Mn digital magnetic alloy (DMA) consisting of Mn monolayers embedded in a Si matrix stacking along [001] direction. The main focus of our study is on the dependence of magnetic properties on the morphology of the Mn monolayer. Three different structural models for the Mn monolayer are considered: manganese in substitutional (i), interstitial (ii), and both interstitial and substitutional (iii) positions. The atomic positions in Si/Mn DMA are determined by means of the VASP code and then serve as input for multiple-scattering calculations of the electronic and magnetic structure. The magnetic force theorem is used to evaluate the exchange coupling parameters. A Heisenberg model based on those parameters is used to estimate magnon frequencies and magnetic phase-transition temperatures for different anisotropies. The magnetic properties of Si/Mn DMA are found to be strongly dependent on the underlying crystalline structure. © 2011 American Physical Society.
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- oai:reposit.haw-hamburg.de:20.500.12738/10857