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Anisotropic spin-spin correlations in Mn_{1}/X(111) (X= Pd, Pt, Ag, and Au)
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Dias, Manuel dos Santos, Staunton, Julie B., Deak, A. and Szunyogh, L. (2011) Anisotropic spin-spin correlations in Mn_{1}/X(111) (X= Pd, Pt, Ag, and Au). Physical Review B (Condensed Matter and Materials Physics), Vol.83 (No.5). 054435. doi:10.1103/PhysRevB.83.054435 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.83.054435
Abstract
We present a finite-temperature theory of the anisotropic spin-spin correlations in magnetic metallic monolayers deposited on a suitable substrate. The spins are the local moments set up by the itinerant electrons, and the key concept is the relativistic disordered local moment state, which represents the paramagnetic state of a set of local moments. The spin-spin correlations between these local moments are then extracted using the linear-response formalism. The anisotropy is included in a fully relativistic treatment, based on the Dirac equation, and has a qualitative impact on noncollinear magnetic states by lifting their chiral degeneracy. The theory is applied to Mn monolayers on the hexagonal (111) surfaces of Pd, Pt, Ag, and Au. The presence of competing exchange interactions is highlighted by choosing different substrates, which favor either the row-wise antiferromagnetic state or the chiral triangular Neel state. We correlate the electronic structure with the magnetic properties by comparing filled with partially filled substrate d bands, and low versus high atomic number. The disagreement between theory and experiment for Mn(1)/Ag(111) is addressed, and the nature of the magnetic domains found experimentally is suggested to be chiral.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 25 February 2011 | ||||
| Dates: |
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| Volume: | Vol.83 | ||||
| Number: | No.5 | ||||
| Page Range: | 054435 | ||||
| DOI: | 10.1103/PhysRevB.83.054435 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | FCT Portugal , FSE/POPH , Hungarian Scientific Research Fund (OTKA), New Hungary Development Plan, Psi-k Network | ||||
| Grant number: | SFRH/BD/35738/2007 (FCT Portugal), OTKA K77771 (OTKA), TAMOP-4.2.1/B-09/1/KMR-2010-0002 (New Hungary Development Plan) |
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