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- W1979266586 abstract "Numerical solutions of the Landau-Lifshitz-Gilbert micromagnetic model incorporating thermal fluctuations and dipole-dipole interactions (calculated by the Fast Multipole Method) are presented for systems composed of nanoscale iron pillars of dimension 9 nm x 9 nm x 150 nm. Hysteresis loops generated under sinusoidally varying fields are obtained, while the coercive field is estimated to be 1979 $pm$ 14 Oe using linear field sweeps at T=0 K. Thermal effects are essential to the relaxation of magnetization trapped in a metastable orientation, such as happens after a rapid reversal of an external magnetic field less than the coercive value. The distribution of switching times is compared to a simple analytic theory that describes reversal with nucleation at the ends of the nanomagnets. Results are also presented for arrays of nanomagnets oriented perpendicular to a flat substrate. Even at a separation of 300 nm, where the field from neighboring pillars is only $sim$ 1 Oe, the interactions have a significant effect on the switching of the magnets." @default.
- W1979266586 created "2016-06-24" @default.
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- W1979266586 date "2001-09-13" @default.
- W1979266586 modified "2023-10-12" @default.
- W1979266586 title "Langevin simulation of thermally activated magnetization reversal in nanoscale pillars" @default.
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- W1979266586 doi "https://doi.org/10.1103/physrevb.64.134422" @default.
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