Magnetoimpedance modulation in a planar magnetoelectric ferromagnet – piezoelectric heterostructure

The effect of a giant change in the impedance ferromagnetic materials under action an external magnetic field is widely used to elaborate highly sensitive sensors. purpose this work was demonstrate possibilities controlling magnitude magnetoimpedance ferromagnet-piezoelectric structure using electric field. Method. In measurements, we planar heterostructure containing strip amorphous ferromagnet Metglas, 25 µm thick and mm long, mechanically connected bimorph, 0.5 30 made piezoceramic lead zirconate titanate. An alternating current with frequency kHz...10 MHz passed through strip, placed longitudinal permanent 0...500 Oe, up 400 V/cm 60 Hz...50 kHz applied piezobimorph, recorded. Results. absence field, narrowing fields region decrease saturation above 334 Oe were observed. maximum value reached 18% at 1 MHz. application piezobimorph led appearance side components spectrum voltage on layer, which indicates amplitude-phase modulation magnetoimpedance. amplitude coefficient 6 · 10−3 for 11.2 decreased monotonically increase occurs due converse magnetoelectric heterostructure, leads magnetization subsequent relative permeability thickness skin layer ferromagnet. results obtained can be create sensors controlled by