Particle interaction in numerical micromagnetic modeling

Abstract

Numerical micromagnetic modeling of a single particle and small numbers of particles has recently greatly increased our understanding of fine particle magnetizing processes, but the behavior of a large number of such interacting particles is not yet completely understood. The analysis presented here shows that the moving-model Preisach approach, as a framework for explaining the behavior of such a distribution, is plausible; however, the proportionality factor is considerably different from the one that had been previously calculated.

Self consistent measurement and removal of the dipolar interaction field in magnetic particle assemblies and the determination of their intrinsic switching field distribution

“…Then, each value of m on the normalized m À H A plane represents the measured coercive field, H c , of all the particles having an intrinsic coercive field, H cðiÞ , which is shifted along the field axis by a quantity equal to the dipolar interaction field for that specific value of m. This allows to rewrite Eq. (2) by interpreting the applied field H A as the measured coercive field H c and the total field, H tot as the intrinsic coercivity, [47][48][49] H cðiÞ ¼ H c À am:…”

Dynamics in the Preisach accommodation model

“…Numerical micromagnetic Manuscript received Feb. 15, 1995. studies [5] have shown that, for particles used in recording media, the field required to nucleate a reversal, H N , is also much larger than that required to propagate the reversal throughout the particle.…”

Stability of Magnetic States in Patterned Materials

“…0 is the coercivity without interactions [11,12]. It was shown that in the calculations the interactions with the surrounding particles can be truncated at the 3rd coordination shell.…”