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


We investigated the magnetoelectric properties of a new laminate composite material based on y + 140 degrees-cut congruent lithium niobate piezoelectric plates with an antiparallel polarized "head-tohead" 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 vertical bar alpha(E31)vertical bar = 1.9V.(cm Oe)(-1). At a bending resonance frequency of 6862 Hz, we found a giant vertical bar alpha(E31)vertical bar value up to 1704V.(cm Oe)(-1). Furthermore, the equivalent magnetic noise spectral density of the investigated composite material was only 92 fT/Hz(1/2), 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. Published by AIP Publishing.



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Turutin, AV; Vidal, JV; Kubasov, IV; Kislyuk, AM; Malinkovich, MD; Parkhomenko, YN; Kobeleva, SP; Pakhomov, OV; Kholkin, AL; Sobolev, NA

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The authors are grateful to JSC "Fomos-Materials" (Moscow, Russia) for providing the high-quality lithium niobate y+140 degrees-cut samples. The work was carried out with the financial support from the following projects and programs: Increase Competitiveness Program of NUST MISiS, implemented by a governmental decree dated 16th of March 2013, No. 211, the project ID: V100-N1-P71 (Ministry of Education and Science of the Russian Federation); Grant 074-U01, 11.4942.2017/6.7 (Government of Russian Federation); I3N/FSCOSD (Ref. FCT UID/CTM/50025/2013) and CICECO-Aveiro Institute of Materials-POCI-01-0247-FEDER-007678 SGH "Smart Green Homes" financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement; European Project H2020-MSCA-RISE-2017-778308-SPINMULTIFILM. J.V.V. acknowledges BOSCH for the grant BPD/CICECO/5339/2018. A.V.T. was supported by the Ministry of Education and Science of the Russian Federation (Scholarship of the President of the Russian Federation for study abroad in the academic year 2017/18 No564) and grant "UMNIK" by the Federal Agency for Science and Innovation No11028GU/2016. I.V.K. was supported by Scholarship of the President of the Russian Federation for young scientists and Ph.D. students implementing perspective studies and developments in priority directions of modernisation of economics of Russia (2018-2020).

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