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Magnetic properties and disorder effects in diluted magnetic semiconductors
Uppsala University.ORCID iD: 0000-0003-4341-5663
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2005 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 72, no 19, 195210- p.Article in journal (Refereed) Published
Abstract [en]

We present calculations of the exchange interactions and critical temperatures for several diluted magnetic semiconductor systems. It is shown that the exchange interactions are dominated by short-ranged interactions that have a strong directional dependence. Using a combination of first-principles calculations of the exchange interactions together with Monte Carlo simulations of the classical Heisenberg model, in which the positional disorder and spin fluctuations are properly included, the calculated critical temperatures are in good agreement with experimantal observations. It is shown that agreement between theory and experiment, as regards ordering temperatures, is obtained only when the magnetic atoms are randomly positioned in a simulation cell which proves that disorder effects play a very important role. The effect of strong electron-electron interaction has been studied by means of the LSDA+U scheme. We investigate in detail the nature of the anisotropic exchange interactions by means of a Fermi surface analysis.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2005. Vol. 72, no 19, 195210- p.
Keyword [en]
ROOM-TEMPERATURE FERROMAGNETISM, EXCHANGE INTERACTIONS, CURIE-TEMPERATURE, DOPED ZNO, GA1-XMNXAS, ALLOYS, FILMS, MN
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-62589DOI: 10.1103/PhysRevB.72.195210ISI: 000233603700064OAI: oai:DiVA.org:kth-62589DiVA: diva2:480639
Note
QC 20120202Available from: 2012-01-19 Created: 2012-01-19 Last updated: 2017-12-08Bibliographically approved

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevB.72.195210

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Bergqvist, Lars

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