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- W2019277111 abstract "In this study we calculate the dipole-coupling-induced quartic in-plane anisotropy of a square ferromagnetic Heisenberg monolayer. This anisotropy increases with an increasing temperature, reaching its maximum value close to the Curie temperature of the system. At $T=0$ the system is isotropic, besides a small remaining anisotropy due to the zero-point motion of quantum mechanical spins. The reason for the dipole-coupling-induced anisotropy is the disturbance of the square spin lattice due to thermal fluctuations (``order-by-disorder'' effect). For usual ferromagnets its strength is small as compared to other anisotropic contributions, and decreases by application of an external magnetic field. The results are obtained from a Heisenberg Hamiltonian by application of a mean field approach for a spin cluster, as well as from a many-body Green's function theory within the Tyablikov decoupling (the random phase approximation)." @default.
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- W2019277111 date "2002-09-16" @default.
- W2019277111 modified "2023-10-16" @default.
- W2019277111 title "In-plane dipole coupling anisotropy of a square ferromagnetic Heisenberg monolayer" @default.
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- W2019277111 doi "https://doi.org/10.1103/physrevb.66.094416" @default.
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