Long-term Memory and Magnetoacoustic Effects ...

Different long-term acoustic memory and magnetoacoustic effects were observed in magnetostrictive materials at their inductive excitation by radiofrequency (RF) and magnetic pulses using pulsed NMR and magnetic video-pulse excitation techniques. Along it the stimulated domain-acoustic echo (DAE), possessing a long-term acoustic memory was inductively excited by three RF pulses in magnetite and magnetoelectric ferrite-piezoelectric layered composites using pulsed NMR technique with inductive and electric recording of DAE signals. In this work we present also the results of comparative study of different magnetoacoustic responses on excitation by a series of RF and magnetic pulses using pulsed NMR and magnetic video-pulse excitation techniques in some magnetostrictive and magnetoelectric materials such as magnetite, magnetoelectric ferrite-piezoelectric layered composites and magnetic bioceramic composite materials interesting for practical applications in biomedicine. In particular, the magnetic video-pulse excitation technique provides a comparatively simple method for wide-band characterization of these materials.