2005年
Preparation and characterization of alpha-Fe2O3/FeTiO3 multi-layered films
NINTH INTERNATIONAL CONFERENCE ON FERRITES (ICF-9)
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- 開始ページ
- 207
- 終了ページ
- 213
- 記述言語
- 英語
- 掲載種別
- 研究論文(国際会議プロシーディングス)
- 出版者・発行元
- AMER CERAMIC SOC
Thin films of the hematite-ilmenite solid solution (ot-Fe2O3-FeTiO3) are one of the candidates for practical magnetic semiconductors with a high Curie temperature (Tc). We have successfully prepared well-crystallized epitaxial Fe1.2Ti0.8O3 films on alpha-Al2O3 substrates by using a reactive helicon plasma sputtering technique. Only the films having the R3 symmetry had large ferrimagnetic moments, where the Fe-rich and the Ti-rich cation layers were alternately stacked along the c-axis. To obtain the order structure (R3) for the Fe1.2Ti0.8O3 films, a higher substrate temperature and/or post annealing at 600 degrees C were very effective. Unfortunately the Fe1.2Ti0.8O3 solution has the lower Tc of about 250 K in bulk form. Trying to raise up the Tc of Fe1.2Ti0.8O3 multilayered films of alpha-Fe2O3/Fe1.2Ti0.8O3 were also prepared. At the moment, though, we did not success the preparation of high-Tc multilayered films beyond the room temperature. Low temperature magnetization measurements and Mossbauer spectroscopy suggested that the exchange coupling between alpha-Fe2O3 and Fe1.2Ti0.8O3 seemed to provide a large possibility to increase the Tc of Fe1.2Ti0.8O3 layers beyond the room temperature.
- リンク情報
- ID情報
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- Web of Science ID : WOS:000227460600034