Title :
Effect of magnetic relaxation times on electromagnetic pulse shielding
Author :
Zayek, Francois ; Mcknight, Stephen W. ; Vittoria, Carmine ; Maisch, W. ; Stauss, G.
Author_Institution :
Center for Electromagn. Res., Northeastern Univ., Boston, MA, USA
fDate :
7/1/1988 12:00:00 AM
Abstract :
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
Keywords :
electromagnetic pulse; magnetisation; shielding; characteristic time delay; electromagnetic pulse; electromagnetic pulse shielding; ferromagnetic conducting thin film; hysteresis effects; magnetic relaxation times; magnetization; nonlinear region; penetration; response time; rise time; saturation; shielding factor; susceptibility; Differential equations; EMP radiation effects; Magnetic flux; Magnetic materials; Magnetic shielding; Magnetic susceptibility; Magnetization; Nonlinear equations; Permeability; Sheet materials;
Journal_Title :
Magnetics, IEEE Transactions on
