ITLApplied  Computational Mathematics Division
ACMD Seminar Series
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Micromagnetic Exchange Energy Formulations

Michael Donahue
Mathematical and Computational Sciences Division

Tuesday, September 16, 2003 15:00-16:00,
Room 145, NIST North (820)
Tuesday, September 16, 2003 13:00-14:00,
Room 4511

Abstract: Micromagnetics is a continuum theory that models behavior of magnetic materials at the nanometer scale. Typically, four component energies are considered: Zeeman (applied magnetostatic), demagnetization (self-magnetostatic), crystalline anisotropy, and exchange. The exchange energy represents the adjacent spin-spin interaction that gives rise to ferromagnetism. Defined in terms of the gradient of the magnetization components, it is especially sensitive to discretization details in a numerical implementation. This talk examines several discretization methods for the exchange energy term, and presents results on convergence rates, boundary conditions, and iterative stability. Effects of the discretization method on vortex mobility and Neel wall collapse are also presented.
Contact: A. J. Kearsley

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Last updated: 2011-01-12.