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Various ordered states in Heisenberg FCC antiferromagnets with dipole-dipole interactions

双極子相互作用を含む面心立方格子上のハイゼンベルグ反強磁性体における様々な秩序状態

横田 光史   

Yokota, Terufumi

Heisenberg antiferromagnet on a face-centered cubic (fcc) lattice with a nearest-neighbor exchange interaction is known to order antiferromagnetically with type-I spin structure. On the other hand, Heisenberg magnet on a fcc lattice with only magnetic dipole-dipole interactions orders ferromagnetically. Both the antiferromagnetic nearest-neighbor exchange interaction and the dipole-dipole interactions introduce frustration into the Heisenberg magnets but differently. Here the Heisenberg fcc antiferromagnets, in which both interactions are included are investigated by numerically solving the Landau-Lifshitz (LL) equation. Various ordered states which include multi-K structures are obtained depending on the relative strength of the two kinds of interactions.

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