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J. Korean Ceram. Soc. > Volume 58(6); 2021 > Article
Journal of the Korean Ceramic Society 2021;58(6): 700-705.
doi: https://doi.org/10.1007/s43207-021-00144-2
Enhanced magnetoelectric coupling in stretch‑induced shear mode magnetoelectric composites
Deepak Rajaram Patil1, Sung Hoon Park1, Seema Patil1, Ajeet Kumar1, Jungho Ryu1,2
1School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, South Korea
2Institute of Materials Technology, Yeungnam University, Gyeongsan 38541, Korea
Correspondence  Jungho Ryu ,Email: jhryu@ynu.ac.kr
Received: July 21, 2021; Revised: September 9, 2021   Accepted: September 11, 2021.  Published online: November 30, 2021.
Magnetoelectric (ME) laminates consisting of Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT)-based single crystals have recently attracted significant interest owing to their excellent piezoelectric properties. Particularly, ME laminates with d15-mode single crystals exhibit the strongest ME coupling, but the fabrication of ME laminates with 15 shear modes is challenging. Herein, we propose the generation of a stretch–shear mode (d15-mode) by clamping the opposite ends of the top and bottom magnetostrictive layers in symmetric ME laminates. Two different shear-stress-induced ME laminates were fabricated using Metglas/Galfenol as magnetostrictive layer, and 15-PMN-PZT as a piezoelectric layer. The ME laminates were studied under two different conditions, unclamped and clamped. Under unclamped condition, Galfenol/15-PMN-PZT/Galfenol (Metglas/15-PMN-PZT/Metglas) laminate showed maximum αME value of 1.71 V/cm∙Oe (0.62 V/cm∙Oe), while under clamped condition, Galfenol/d15-PMN-PZT/Galfenol (Metglas/15-PMN-PZT/Metglas) laminate exhibited an enhanced αME value of 2.40 V/cm∙Oe (0.87 V/cm∙Oe), indicating successful generation of the stretch–shear mode. Under clamped condition, αME was enhanced by 140% compared with the that of the unclamped case, suggesting a 40% (0.25 V/cm∙Oe) contribution from the pure shear ME voltage coefficient along with the longitudinal extension contribution.
Key words: Magnetoelectric laminates · ME effect · Piezoelectric coefficient · Magnetostriction · Piezomagnetic coefcient
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