Magnetoelectric metglas/bidomain y + 140°-cut lithium niobate composite for sensing fT magnetic fields

• Main Author: Turutin, Andrei V.
• Publication Date: 2018
• Other Authors: Vidal, João V., Kubasov, Ilya V., Kislyuk, Alexander M., Malinkovich, Mikhail D., Parkhomenko, Yurii N., Kobeleva, Svetlana P., Pakhomov, Oleg V., Kholkin, Andrei L., Sobolev, Nikolai A.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/10773/27877
• topic: Oxides; Multiferroics; Electronic noise; Ferroelectric materials; Composite materials; Magnetic devices; Crystalline solids; Dielectric properties; Piezoelectricity; Magnetic fields

We investigated the magnetoelectric properties of a new laminate composite material based on y+140°-cut congruent lithium niobate piezoelectric plates with an antiparallel polarized “head-to-head” bidomain structure and metglas used as a magnetostrictive layer. A series of bidomain lithium niobate crystals were prepared by annealing under conditions of Li2O outdiffusion from LiNbO3 with a resultant growth of an inversion domain. The measured quasi-static magnetoelectric coupling coefficient achieved |αE31| = 1.9 V·(cm·Oe)–1. At a bending resonance frequency of 6862 Hz, we found a giant |αE31| value up to 1704 V·(cm·Oe)–1. Furthermore, the equivalent magnetic noise spectral density of the investigated composite material was only 92 fT/Hz1/2, a record value for such a low operation frequency. The magnetic-field detection limit of the laminated composite was found to be as low as 200 fT in direct measurements without any additional shielding from external noises.