Effect of NiZnFeO4 content on PZT-pZN + NiZnFeO4 magnetoelectric composite.
We fabricated and characterized the magnetoelectric (ME) properties of 3-0 ME composite materials comprised of the high piezoelectric voltage coefficient material, 0.9Pb(Zr0.52Ti0.48)O3-0.1 Pb(Zn1/3Nb2/3)O3 + 0.005Mn (PZT-PZN), and the magnetostrictive material, Ni0.8Zn0.2Fe2O4 (NZF). As the ME effect is generated by the product coupling between the piezoelectric properties and the magnetostrictive properties, the NZF content should be optimized for a higher ME coefficient. The dielectric constant and spontaneous polarization (P) were decreased with increasing NZF content before the percolation of the NZF particulates. However, as the NZF content exceeded the percolation content, the dielectric loss was dramatically increased due to the low resistivity of NZF. While the piezoelectric constant was decreased with increasing NZF content, the maximum magnetization was linearly increased. When we combined the piezoelectric and magnetostrictive effects, the ME composite sintered at 1200 degrees C with 20% NZF showed a maximum dE/dH of 27 mV/cm x Oe at a magnetic bias of 1240 Oe.
Functional Ceramics Research Group, Korea Institute of Materials Science (KIMS), Changwon, Gyeongnam 641-831, Korea.
Jungho
J
Ryu
Chang-Woo
CW
Baek
Yong-Seok
YS
Lee
Guifang
G
Han
Nam-Keun
NK
Oh
Jong-Woo
JW
Kim
Byung-Dong
BD
Hahn
Woon-Ha
WH
Yoon
Jong-Jin
JJ
Choi
Dong-Soo
DS
Park
Dae-Yong
DY
Jeong