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Effect of magnetic relaxation times on electromagnetic pulse shielding

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5 Author(s)
Zayek, F. ; Center for Electromagn. Res., Northeastern Univ., Boston, MA, USA ; McKnight, S.W. ; Vittoria, Carmine ; Maisch, W.
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The penetration of an electromagnetic pulse (EMP) through a ferromagnetic conducting thin film is investigated for the case in which the magnetization of the material has a characteristic time delay τ. Both saturation and hysteresis effects of he magnetization are considered and the susceptibility is defined in the nonlinear region as dM/dh. It is found that the response time τ has a significant effect on the shielding factor with optimum shielding when τ is on the order of twice the rise time of the pulse

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Magnetics, IEEE Transactions on  (Volume:24 ,  Issue: 4 )