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Magnetic interactions of substitutional Mn pairs in GaAs
Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.ORCID iD: 0000-0003-4489-7561
University of Texas at Austin (U.S.A.).
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 81, no 5, article id 054401Article in journal (Refereed) Published
Abstract [en]

We employ a kinetic-exchange tight-binding model to calculate the magnetic interaction and anisotropy energies of a pair of substitutional Mn atoms in GaAs as a function of their separation distance and direction. We find that the most energetically stable configuration is usually one in which the spins are ferromagnetically aligned along the vector connecting the Mn atoms. The ferromagnetic configuration is characterized by a splitting of the topmost unoccupied acceptor levels, which is visible in scanning tunneling microscope studies when the pair is close to the surface and is strongly dependent on pair orientation. The largest acceptor splittings occur when the Mn pair is oriented along the < 110 > symmetry direction and the smallest when they are oriented along < 100 >. We show explicitly that the acceptor splitting is not simply related to the effective exchange interaction between the Mn local moments. The exchange interaction constant is instead more directly related to the width of the distribution of all impurity levels-occupied and unoccupied. When the Mn pair is at the < 110 > GaAs surface, both acceptor splitting and effective exchange interaction are very small except for the smallest possible Mn separation.

Place, publisher, year, edition, pages
2010. Vol. 81, no 5, article id 054401
National Category
Condensed Matter Physics Condensed Matter Physics
Research subject
Natural Science, Physics
Identifiers
URN: urn:nbn:se:lnu:diva-2060DOI: 10.1103/PhysRevB.81.054401ISI: 000274998000051Scopus ID: 2-s2.0-77954789797OAI: oai:DiVA.org:lnu-2060DiVA, id: diva2:309108
Available from: 2010-04-06 Created: 2010-04-06 Last updated: 2022-07-14Bibliographically approved

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Strandberg, OlofCanali, Carlo M.

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