Self-Biased Magnetoelectric Sensor Operating in d36 Face-Shear Mode

A magnetoelectric (ME) sensor of face-shear type is demonstrated based on the ME composite consisting of (PbMg
$_{{0}.{33}}$
Nb{0}.{67}O{3}}{)}_{{1}-{x}-(PbTiO
$_{{3}}{)}_{x}$
piezoelectric single crystal (abbreviated as PMN-PT) and Metglas amorphous alloy. The face-shear strain is induced in PMN-PT via the magnetostriction of Metglas under a magnetic field, which generates an ME voltage through the
${d}_{{36}}$
piezoelectric coefficient. The proposed sensor reveals a high ME coupling coefficient of 48.8 V/cm Oe at resonant frequency (
$\sim $
107.5 kHz), which is self-biased with the capability to detect ac magnetic fields of 4.58 nT at 1 kHz and 10.43 pT at resonant frequency, respectively. The self-biased face-shear mode ME sensor exhibits great potential for weak magnetic field detection.