| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Periodic Boundary Conditions for Finite-Differentiation-Method Fast-Fourier-Transform Micromagnetics |
| Jiang-Nan Li, Dan Wei**, |
Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084
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Abstract We describe an accurate periodic boundary condition (PBC) called the symmetric PBC in the calculation of the magnetostatic interaction field in the finite-differentiation-method fast-Fourier-transform (FDM-FFT) micromagnetics. The micromagnetic cells in the regular mesh used by the FDM-FFT method are finite-sized elements, but not geometrical points. Therefore, the key PBC operations for FDM-FFT methods are splitting and relocating the micromagnetic cell surfaces to stay symmetrically inside the box of half-total sizes with respect to the origin. The properties of the demagnetizing matrix of the split micromagnetic cells are discussed, and the sum rules of demagnetizing matrix are fulfilled by the symmetric PBC.
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Received: 29 November 2016
Published: 01 April 2017
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| PACS: |
75.78.Cd
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(Micromagnetic simulations ?)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 51171086 and 51371101. |
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