Models of elastic and inelastic flux switching

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Abstract
The total\dot{\phi}(t)waveform of a square-loop magnetic core switched by MMFF(t)from negative remanence\phi = -\phi_{r}is composed of elastic\dot{\phi}_{\epsilon}(t), decaying inelastic\dot{\phi}_{i}(t), and bell-shaped main inelastic\dot{\phi}_{ma}(t). The worst delta noise in a coincident-current memory core pair is essentially\dot{\phi}_{i}(t). The sources of these components and the static\phi(F)curve are explained qualitatively by means of the random variations of the energy gradient vs. domain-wall position: elastic wall displacements and elastic rotation of magnetization induce\dot{\phi}_{\epsilon}(t); minor inelastic wall displacements of essentially constant wall areas induce\dot{\phi}_{i}(t); and major inelastic wall displacements (involving domain collisions) of varying wall areas induce\dot{\phi}_{ma}(t). Semiempirical models for the\dot{\phi}components are based on the characteristics of these displacements. A satisfactory agreement is obtained between these models and\dot{\phi}(t)oscillograms of a thin ferrite core.

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