论文信息 - rf oxygen plasma assisted molecular beam epitaxy growth of BiFeO3 thin films on SrTiO3 (001)

rf oxygen plasma assisted molecular beam epitaxy growth of BiFeO3 thin films on SrTiO3 (001)

BiFeO3 (BFO) thin films were grown epitaxially by rf oxygen plasma assisted molecular beam epitaxy on SrTiO3 (001) substrates with and without SrRuO3 (SRO) thin film electrodes. BFO thin films show excellent crystalline quality and x-ray diffraction studies show the presence of only one phase. Polarized Raman spectroscopy also confirmed high crystalline quality of the films. BFO thin films show presence of ferroelectricity on conducting Nb:STO substrates and SRO-STO. Films on Nb:STO have leakage currents ∼0.1μA∕cm2 and remnant polarization ∼28μC∕cm2. Films on SRO-STO have leakage currents ∼8nA∕cm2 and remnant polarization ∼56μC∕cm2. Nb diffusion and poor surface quality of Nb:STO can be attributed to the difference in ferroelectric and leakage properties of the BFO thin films grown on Nb:STO and SRO-STO.

R. Katiyar | P. Dobal | S. Ghosh | J. Kabelac

[1] H. M. Jang,et al. Polarized Raman scattering of multiferroicBiFeO3thin films with pseudo-tetragonal symmetry , 2005 .

[2] Junling Wang,et al. Epitaxial BiFeO3 thin films on Si , 2004 .

[3] M. Okuyama,et al. Structural and multiferroic properties of BiFeO3 thin films at room temperature , 2004 .

[4] Zu-liang Liu,et al. Room-temperature saturated ferroelectric polarization in BiFeO3 ceramics synthesized by rapid liquid phase sintering , 2004 .

[5] M. Okuyama,et al. Prominent ferroelectricity of BiFeO3 thin films prepared by pulsed-laser deposition , 2003 .

[6] R. Ramesh,et al. Epitaxial BiFeO3 Multiferroic Thin Film Heterostructures , 2003, Science.

[7] V. Palkar,et al. Observation of saturated polarization and dielectric anomaly in magnetoelectric BiFeO3 thin films , 2002 .

[8] Nicola A. Hill,et al. Why Are There so Few Magnetic Ferroelectrics , 2000 .

[9] Mahesh Kumar,et al. Ferroelectricity in a pure BiFeO3 ceramic , 2000 .

[10] S. Suryanarayana,et al. Magnetic and Magnetoelectric Studies in Polycrystalline LaBi4FeTi3O15 , 1997 .

[11] S. Suryanarayana. Magnetoelectric interaction phenomena in materials , 1994 .

[12] S. Suryanarayana,et al. Dielectric and magnetoelectric properties of Bi5FeTi3O15 , 1994 .

[13] Robert Gerson,et al. Dielectric hysteresis in single crystal BiFeO3 , 1970 .

[14] R. Loudon. The Raman effect in crystals , 1964 .