The first observation of self-oscillations of an ordered magnetic structure
is reported. They were detected by the Mossbauer effect in the Tb0.8Y0.2Fe
2 ferrimagnetic compound and occur with a period of several days. The oscil
lations were initiated by a single electric-field pulse (similar to 10(8) k
V cm(-1) s(-1)). A phenomenological model of the phenomenon is proposed. (C
) 2000 MAIK "Nauka/Interperiodica".