Title :
Fast protector against EMP using electrical field induced resistance change in La/sub 0.67/Ca/sub 0.33/MnO/sub 3/ thin films
Author :
Altgilbers, L. ; Balevicius, S. ; Kiprijanovic, O. ; Pyragas, V. ; Tornau, E.E. ; Jukna, A. ; Vengalis, B. ; Anisimovas, F.
Author_Institution :
US Army Missile Defence & Space Technol. Center, Huntsville, AL, USA
Abstract :
La/sub 0.67/Ca/sub 0.33/MnO/sub 3/ thin films were investigated using nanosecond duration electrical pulses. It was found that strong (up to 30 kV/cm) electric fields significantly reduces the resistance of the film and shifts the peak in resistance vs. temperature dependence to higher temperatures. The results are discussed using a model based on fast spin and charge system response to electric field action on the magnetic material. It was concluded that electric field induced changes in the La/sub 0.67/Ca/sub 0.33/MnO/sub 3/ thin film´s resistance can be used to protect fast 50 ohm impedance high frequency transmission lines against short rise time fault current pulses.
Keywords :
calcium compounds; electromagnetic pulse; fault current limiters; lanthanum compounds; magnetic thin film devices; overcurrent protection; 50 ohm; EMP protector; La/sub 0.67/Ca/sub 0.33/MnO/sub 3/; charge system response; electrical field induced resistance change; fast spin; fault current limiters; high frequency transmission lines; magnetic thin films; nanosecond duration pulses; short rise time fault current pulses; EMP radiation effects; Electric resistance; Frequency; Impedance; Magnetic films; Magnetic materials; Protection; Temperature dependence; Transistors; Transmission lines;
Conference_Titel :
Pulsed Power Plasma Science, 2001. PPPS-2001. Digest of Technical Papers
Conference_Location :
Las Vegas, NV, USA
Print_ISBN :
0-7803-7120-8
DOI :
10.1109/PPPS.2001.1001918
