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Pulse Width (10 s)

Figure 19. Simulation of the dynamic coercivity experiment in an interacting Co-based granular media using a micromagnetic model of the group of R. W. Chantrell [135]. The remanent magnetization is represented as a function of squared pulse duration for different applied field values. Reprinted with permission from J. D. Hannay et al., J. Appl. Phys. 85 5012 (1999), © 1999, American Institute of Physics.

Pulse Width (10 s)

Figure 19. Simulation of the dynamic coercivity experiment in an interacting Co-based granular media using a micromagnetic model of the group of R. W. Chantrell [135]. The remanent magnetization is represented as a function of squared pulse duration for different applied field values. Reprinted with permission from J. D. Hannay et al., J. Appl. Phys. 85 5012 (1999), © 1999, American Institute of Physics.

small damping case, a = 0.05 (Fig. 20), the peaks in the remanent magnetization as a function of the pulse duration have been observed due to precessional motion [120].

The exchange interactions seem to reduce or remove these peculiarities (Fig. 19), which may be interpreted in terms of the effective increase of the damping. Generally,

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