The action of transverse shock waves (the shock wave propagates across the magnetization vector M) on the magnetic phase state of a Nd2Fe14B high-energy hard ferromagnetic was investigated experimentally. The design of the ferromagnetic sample, which was made as a hollow cylinder, has made it possible to dramatically reduce the amount of the explosive that initiates a transverse shock wave in Nd2Fe14B to 1.0 g (for Nd2Fe14B samples weighing 67.5 g). The results of the experiment have shown that the transverse shock wave propagating through Nd2Fe14B causes “hard ferromagnetic-to-paramagnetic” phase transformation terminating by practically complete demagnetization of Nd2Fe14B. Pulse generators based on the transverse shock wave demagnetization of hollow cylindrical Nd2Fe14B samples with diameter of 25.4 mm and length of 19.1 mm are capable of producing high-voltage pulses [peak voltage of 11.3 kV, full width at half maximum (FWHM) of 4.5 μs] and high-current pulses (peak current of 1.93 kA, FWHM of 100 μs, peak power of 27.0 kW). The effect of transverse shock wave demagnetization of high-energy hard ferromagnetic, Nd2Fe14B, was detected.

Topics
Ferromagnetism, Paramagnetic materials, Phase transitions, Shock waves, Electrical properties and parameters, Pulse generators, Explosives
1.
L. L. Altgilbers, M. D. J. Brown, I. Grishnaev, B. M. Novac, I. R. Smith, I. Tkach, and Yu. Tkach, Magnetocumulative Generators (Springer, New York, 2000).
2.
F. W.
Neilson
and
G. W.
Anderson
,
Bull. Am. Phys. Soc.
2
,
302
(
1957
).
Google Scholar
 
3.
R. W.
Kulterman
,
F. W.
Neilson
, and
W. B.
Benedick
,
J. Appl. Phys.
29
,
500
(
1958
).
Google Scholar
Crossref
Search ADS
 
4.
P. Campbell, Permanent Magnet Materials and Their Application (Cambridge University Press, Cambridge, UK, 1994).
5.
S. I.
Shkuratov
,
E. F.
Talantsev
,
J. C.
Dickens
, and
M.
Kristiansen
,
J. Appl. Phys.
91
,
3007
(
2002
).
Google Scholar
Crossref
Search ADS
 
6.
S. I. Shkuratov, E. F. Talantsev, J. C. Dickens, and M. Kristiansen, Appl. Phys. Lett. (to be published).
7.
L.
Davison
and
R. A.
Graham
,
Phys. Lett.
55
,
255
(
1979
).
Google Scholar
 
8.
R. N. Keeler and E. B. Royce, in Proceedings of the International School of Physics “Enrico Fermi,” Villa Monastero, Italy, 4–26 July, 1969, Course XLVIII, edited by P. Caldirola and H. Knoepfel (Academic, New York, 1971), pp. 51–150.
This content is only available via PDF.
© 2002 American Institute of Physics.
2002
American Institute of Physics
You do not currently have access to this content.