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Effect of working pressure on the properties of BaTiO3-CoFe2O4 composite films deposited on STO (100) by PLD |
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| Authors: | Kyoung Sun Kim Jeong Seog Kim Chae Il Cheon |
| Affiliation: | a Department of Materials Science and Engineering, KAIST, Daejeon, 305-701, Republic of Korea b Department of Semiconductor and Display Engineering, Hoseo University, Asan, Chungnam, 336-795, Republic of Korea c Department of Materials Science and Engineering, Hoseo University, Asan, Chungnam, 336-795, Republic of Korea |
| Abstract: | The BaTiO3-CoFe2O4 (BTO-CFO) composite films were grown on SrTiO3 (STO) (100) substrates at 750 °C under various working pressures by pulsed laser deposition. The composite film grew into a supersaturated single phase at the working pressure of 10 mTorr, BTO and CFO (00 l) oriented hetero-epitaxial films on STO (100) at 100 mTorr, and a polycrystalline composite film at 500 mTorr. The slow growth rate at high working pressure led to the phase separation in the composite film. The CFO was compressively strained along out-of-plane due to the lattice mismatch with the BTO matrix phase. The BTO-CFO composite film grown at 100 mTorr showed reversible switching of ferroelectric polarization and magnetic hysteresis with strong magnetic anisotropy. |
| Keywords: | Epitaxial growth Nanocomposites BaTiO3 CoFe2O4 Working pressure PLD |
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