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Energetics and switching of quasi-uniform states in small ferromagnetic particles \ud

By François Alouges, Sergio Conti, Antonio DeSimone and Yvo Pokern

Abstract

We present a numerical algorithm to solve the micromagnetic equations based on tangential-plane minimization for the magnetization update and a homothethic-layer decomposition of outer space for the computation of the demagnetization field. As a first application, detailed results on the flower-vortex transition in the cube of Micromagnetic Standard Problem number 3 are obtained, which confirm, with a different method, those already present in the literature, and validate our method and code. We then turn to switching of small cubic or almost-cubic particles, in the single-domain limit. Our data show systematic deviations from the Stoner-Wohlfarth model due to the non-ellipsoidal shape of the particle, and in particular a non-monotone dependence on the particle size

Topics: QA, QC
Publisher: EDP Sciences
Year: 2004
OAI identifier: oai:wrap.warwick.ac.uk:3825

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  1. (1948). A mechanism of magnetic hysteresis in heterogeneous alloys. doi
  2. (1997). A new algorithm for computing liquid crystal stable configurations: the harmonic mapping case. doi
  3. (1993). A new finite element method in micromagnetics. doi
  4. (1998). afer, Magnetic domains.
  5. and 3d calculations of micromagnetic wall structures using finite elements. doi
  6. (1997). Angular dependence of nucleation by curling in a prolate spheroid. doi
  7. (2000). Coherent rotation of magnetization in three dimensions: a geometrical approach. doi
  8. (2001). Computation of demagnetizing field in micromagnetics with the infinite elements method. doi
  9. (1957). Criterion for uniform micromagnetization. doi
  10. (1957). Critical size and nucleation field of ideal ferromagnetic particles. doi
  11. (2002). Finite element calculations on the single-domain limit of a ferromagnetic cube – a solution to µmag standard problem no. doi
  12. (1992). Finite element methods for micromagnetics. doi
  13. (1995). Hysteresis and imperfection sensitivity in small ferromagnetic particles. doi
  14. (1998). Hysteresis in magnetism. doi
  15. (1995). Infinite elements method.
  16. (1996). Introduction to the theory of ferromagnetism. doi
  17. (1998). Magnetic states of small cubic particles with uniaxial anisotropy. doi
  18. (1991). Magnetization curling in an infinite cylinder with a uniaxial magnetocrystalline anisotropy. doi
  19. (1988). Magnetization processes in ferromagnetic cubes. doi
  20. (1993). Method for investigating the reversal properties of isolated barium ferrite fine particles utilizing magnetic force microscopy (mfm). doi
  21. (1997). o g i e r ,S .L a b b ´ ea n dP . Y .B e r t i n ,Sch´ ema en temps et calcul du champ d´ emagn´ etisant pour le micromagn´ etisme. NUMELEC’97, ´ Ecole Centrale de Lyon
  22. (1999). o n e t ,W .W e r n s d o r f e r ,B .B a r b a r a ,A .B e n o ˆ ıt, doi
  23. (1996). Preparation and quantitative magnetic studies of single-domain nickel cylinders. doi
  24. (1998). Standard problem number 3, problem specification and reported solutions, Micromagnetic Modeling Activity Group,
  25. (1998). The curling nucleation mode in a ferromagnetic cube. doi
  26. (1989). The weak solutions to the evolution problems of harmonic maps. doi

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