Enhanced magnetoelectric coupling in stretch‑induced shear mode magnetoelectric composites

Patil, Deepak Rajaram; Park, Sung Hoon; Patil, Seema; Kumar, Ajeet; Ryu, Jungho; Patil, Deepak Rajaram; Park, Sung Hoon; Patil, Seema; Kumar, Ajeet; Ryu, Jungho

doi:2021.58.6.700

J. Korean Ceram. Soc. > Volume 58(6); 2021 > Article

Original 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 Ryu^1,2

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.

ABSTRACT

Magnetoelectric (ME) laminates consisting of Pb(Mg_1/3Nb_2/3)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 α_ME 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 α_ME value of 2.40 V/cm∙Oe (0.87 V/cm∙Oe), indicating successful generation of the stretch–shear mode. Under clamped condition, α_ME 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