Of .tbdyfe / Fe Multilayers Magnetostrictive And Piezoelectric Substrate Magnetic - Electrical Conversion Performance

The properties of Fe, TbDyFe films and TbDyFe/Fe multilayers prepared by DC magnetron sputtring were investigated in this paper. The purpose was to find a way to improve the magnetostriction of the TbDyFe films,especially in low magnetic field. The magnetic-mechanical-electrical translation effect of the films,which were sputtered on the PMN-PT piezoelectric base, was also studied .Microstructure of the films was analyzed by SEM and XRD.The results showed that the single Fe films were in the form of α-Fe while TbDyFe films were amorphous.The microstructure of the multilayers was made up of α-Fe and TbDyFe amorphous. The microstructure of the single Fe and TbDyFe monolayers had changed little after they were annealed below 450℃,but that of the multilayers were sensitive to the annealing temperature. They were oxidized after annealed at even 250℃.The investigation on the films' magnetic properties revealed that the easy axis of the single TbDyFe films were vertical to the surface,while that of the Fe monolayers and TbDyFe/Fe multilayers were parallel to the surface .Both Ms and Mr/Ms increased while the He and Hs decreased as a result of the addition of the soft magnetic Fe films.The easy axis moved from the films surface to the vertical location with the increase of multilayers' annealing temperature. The mechanism of magnetization were changed from magnetic nuclear forming to domain wall nailing.The saturated magnetostriction of the multilayers were superior to that of the TbDyFe monolayers,especially in low magnetic field.Moreover,the magnetostriction of the multilayers increased sharply with the decrease of the Fe films' thichness when they were within the length of exchange coupling.The same phenomena has discoverd when annealed under 250℃,but the contrary results had because of the oxidation when the temperature over 450℃.The research on the magnetic-electric translation effect of TbDyFe/PMN-PT and (TbDyFe/Fe)/PMN-PT indicated that the output poling voltage was relation to the PMN-PT's width and the films' magnetostriction. The more wider the base's width and themagnetostriction were , the higher the output voltage in the static electric field was.