Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Phase Evolution Behavior of Multiferroic (Bi,Nd)(Fe,Ti)$O_3$ Ceramics and Thin Films

(Bi,Nd)(Fe,Ti)$O_3$ 다강체 세라믹 및 박막의 상변화 거동

  • Kim, Kyung-Man (School of Materials Science and Engineering, Yeungnam University) ;
  • Yang, Pan (School of Materials Science and Engineering, Yeungnam University) ;
  • Lee, Jai-Yeoul (School of Materials Science and Engineering, Yeungnam University) ;
  • Lee, Hee-Young (School of Materials Science and Engineering, Yeungnam University)
  • Published : 2008.11.06
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Abstract

The coupling between electric, magnetic, and structural order parameters results in the so-called multiferroics, which possess ferroelectricity, ferromagnetism, and/or ferroelasticity. The simultaneous ferroelectricity and ferromagnetism (magnetoelectricity) allow potential applications in information storage, spintronics, and in magnetic or electric field sensors. Perovskite compound $BiFeO_3$ (BFO) is antiferromagnetic below Neel temperature of 647K and ferroelectric with a high Curie temperature of 1043K. It exhibits weak magnetism at room temperature(RT) due to the residual moment from a canted spin structure. It is likely that non-stoichiometry and second-phase formation are the factors which cause leakage in BFO. It has been suggested that oxygen non-stoichiometry leads to valence fluctuations of Fe ions in BFO, resulting in high conductivity. To reduce the large leakage current of BFO, one attempt is fabricating donor doped BFO compounds and thin films. We report here the successful fabrication of the Nd, Ti co-doped $BiFeO_3$ ceramics and thin films by pulsed laser deposition technique.

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