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J. Korean Ceram. Soc. > Volume 44(6); 2007 > Article
Journal of the Korean Ceramic Society 2007;44(6): 308.
doi: https://doi.org/10.4191/kcers.2007.44.6.308
Lanthanum이 첨가된BiFeO3−PbTiO3 세라믹스의 전자효과에 대한 연구
이은구, 김선재1, 이재갑2
조선대학교 신소재공학과
1세종대학교 나노공학과
2국민대학교 신소재공학부
A Study on the Magnetoelectric Effect in Lanthanum Modified BiFeO3−PbTiO3 Ceramics
Eun-Gu Lee, Sun-Jae Kim1, Jae-Gab Lee2
Department of Advanced Materials Engineering, Chosun University
1Department of Advanced Institute of Nano Technologies, Sejong University
2School of Advanced Materials Engineering, Kookmin University
Ferroelectric, magnetic, and magnetoelectric effects for lanthanum modified $BiFeO_3-PbTiO_3$ ceramics have been investigated. The data show that magnetoelectric polarization coefficient, ${alpha}_p$ is due to a linear coupling between polarization and magnetization, and that ${alpha}_p$ is independent of dc magnetic bias and ac magnetic field. The values of ${alpha}_p$ and magnetic induced susceptibility for lanthanum modified $BiFeO_3-PbTiO_3$ ceramics are much larger than those of single $BiFeO_3$ crystal. We believe that the magnetoelectric effect is significantly enhanced by breaking of the cycloidal spin state of a long-period spiral spin structure due to randomly distributed charged imperfections.
Key words: Ferroelectric, Ferromagnetic, Magnetoelectric effects
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