2008/08/28 by L. Szunyogh, B. Lazarovits, L. Udvardi +3 · 4 citations
Chemistry · Mathematics · Physics and Astronomy · #Anisotropy #Chemistry #Condensed matter physics #Crystallography #Geometry #Ground state #Magnetic anisotropy #Magnetic field #Magnetic properties of thin films #Magnetization #Materials science #Mathematics #Order (exchange) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Symmetry (geometry) #Theoretical and Computational Physics #Thermodynamics #cond-mat.other
paper · pdf · doi:10.1103/physrevb.79.020403
published as Phys. Rev. B 79, 020403(R) (2009) · 4 pages, 4 figures
arxiv created 2008/08/28 · openalex publication_date 2009/01/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We perform an ab initio study of the ordered phases of IrMn and IrMn3, the most widely used industrial antiferromagnets. Calculation of the form and the strength of the magnetic anisotropy allows the construction of an effective spin model, which is tested against experimental measurements regarding the magnetic ground state and the N'eel temperature. Our most challenging result is the extremely strong second-order anisotropy for IrMn3 appearing in its frustrated triangular magnetic ground state, which is surprising since the ordered L12 phase has a cubic symmetry. We explain this large anisotropy by the fact that cubic symmetry is locally broken for each of the three Mn sublattices.