Longitudinal-shock-wave compression of Nd[sub 2]Fe[sub 14]B high-energy hard ferromagnet: The pressure-induced magnetic phase transition

Shkuratov, Sergey I.; Talantsev, Evgueni F.; Dickens, James C.; Kristiansen, Magne; Baird, Jason
February 2003
Applied Physics Letters;2/24/2003, Vol. 82 Issue 8, p1248
Academic Journal
A study of a magnetic phase state of Nd[SUB2]Fe[SUB14]B high-energy hard ferromagnets subjected to longitudinal-shock-wave compression (where the shock wave propagates along magnetization vector M) has been performed. The results of the investigation show that longitudinal-shock-wave compression of Nd[SUB2]Fe[SUB14]B at 28-38 GPa causes a magnetic phase transition terminated by practically complete demagnetization of Nd[SUB2]Fe[SUB14]B. Due to this phase transition all electromagnetic energy stored in Nd[SUB2]Fe[SUB14]B is released and can be transformed into pulsed power. Explosive-driven autonomous sources of primary power utilizing this effect are capable of producing high-current pulses [current amplitude of 1.0 kA, full width at half maximum (FWHM) of 165 μs] and high-voltage pulses (peak voltage of 13.4 kV, FWHM of 8.2 ms).


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