title: Metglas/Pb(Mg1/3Nb2/3)O3-PbTiO3 magnetoelectric gradiometric sensor with high detection sensitivity.
abstract: We developed a novel biaxial magnetoelectric (ME) gradiometer sensor system using Metglas/ Pb(Mg(1/3)Nb(2/3))O(3)-PbTiO(3) laminates for investigation of ac magnetic dipole detection. We demonstrate a detection sensitivity of 20 pT/√Hz in an open environment (unshielded) at quasi-static frequencies with a noise rejection efficiency of 23.5 dB, relative to a uniform external noise. In addition, a signal processing method was used to compute the magnetic field amplitude at a driven frequency of 7 Hz, and the results were also verified by theory. Practical testing and mathematical predictions show that there are only 7.2% and 4.2% gradiometric measurement errors in the x- and y-axis gradiometer components, enabling high-precision target detection.
authors.affiliation: Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, USA. shenying@vt.edu
authors.forename: Ying
authors.initials: Y
authors.lastname: Shen
authors.forename: Keith L
authors.initials: KL
authors.lastname: McLaughlin
authors.forename: Junqi
authors.initials: J
authors.lastname: Gao
authors.forename: David
authors.initials: D
authors.lastname: Gray
authors.forename: Davresh
authors.initials: D
authors.lastname: Hasanyan
authors.forename: Yaojin
authors.initials: Y
authors.lastname: Wang
authors.forename: Jiefang
authors.initials: J
authors.lastname: Li
authors.forename: Dwight
authors.initials: D
authors.lastname: Viehland