| 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 |
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| ABSTRACT |
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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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