Switching Dynamics of an Assembly of Interacting Anisotropic Ferromagnetic Particles

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Abstract
In this paper, the switching dynamics of assemblies of large number of anisotropic ferromagnetic particles interacting via dipolar forces is reported. The shape of the M‐H loop as well as the coercive force have been found to be dependent not only on the number of particles in the array but also on their detail spatial arrangement. In particular, quantities such as the initial switching field Hsi, the coercive force Hc, and the final switching field Hsf are sensitive functions of the ratio between the spacing of the dipoles in the recording track direction and that in directions perpendicular to it. Furthermore, the behavior of an array extended in the recording track direction was found to be markedly different from that extended in directions perpendicular to a recording track. Reduction of the coercive force due to particle interaction as well as the incoherent‐rotation mode of switching is also discussed.

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