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JOURNAL OF APPLIED PHYSICS
Volume 87, Issue 9, Pages 6101-6103Publisher
AMER INST PHYSICS
DOI: 10.1063/1.372622
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Cr and Mn monolayers on a triangular lattice are prototypical examples of frustrated spin systems in two dimensions. Collinear and noncollinear magnetic structures of these monolayers on Cu(111) substrate are investigated on the basis of first-principles total-energy calculations using the full-potential linearized augmented plane-wave method extended by the vector spin-density description for the interstitial and vacuum region. The search for the magnetic minimum-energy configurations included unit cells with one, two, and three atoms. For Cr the minimal energy was found for a 120 degrees spin configuration in a (root 3x root 3)R30 degrees unit cell, which is in agreement with the classical nearest-neighbor Heisenberg model with antiferromagnetic exchange interaction. The same behavior is expected for Mn, but a surprising result was found: the minimal energy was found for a collinear row-wise antiferromagnetic structure. (C) 2000 American Institute of Physics. [S0021-8979(00)51008-1].
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