A thin ferrite core (o.d./i.d.=1.06; Fc=0.9 At; φr=3.45 Mx) of nominal composition [Mg0.32Zn0.10Mn0.58]2+[Mn0.52Fe1.48]3+O4was mounted coaxially in a 50-Ω transmission line. Rectangular current pulses (0.4-nsec 10%−90% risetime Tr, and amplitude I varying in five steps from 0.9 to 40 A) were generated by a mercury-relay pulser and fed into the line. The pulses switched the core elastically from remanence (φ=φr) further into saturation (``shuttle'' switching). For each I value, the elastic φ̇(t), φ̇ε(t), was photographed on a sampling oscilloscope, and was found to include two components: an initial spike, φ̇εr(t), and a decaying tail, φ̇εw(t). [When a 1200-Oe transverse field was superimposed, φ̇εw(t) disappeared.] Each component was computed by solving a second-order differential equation of the form: φε+δφ̇ε+ηφ¨ε=εF, where δ, η, and ε are coefficients, and F is the applied mmf. Accounting for air flux, a very good fit was obtained in the entire I range by using the values δr=0.28 nsec and ηr=0.08 nsec2 for φ̇εr (underdamped with 490 Mc/sec oscillation), and δw=4 nsec and ηw=2 nsec2 for φ̇εw (overdamped). Correlation of φ̇εr(t) with Gilbert equation yields α≈0.57 and K1≈[minus]3.6·104 ergs/cm3. For either component, φε+δφ̇ε≈εF if Tr≫η/δ, e.g., if Tr≳5 nsec. It was found that δr and δw increase with Tr. For Tr=65 nsec, δr≈δw≈6 nsec; hence, φ̇εr≈εrḞ and φ̇εw≈εwḞ if Tr≳60 nsec.
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