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Magnetic properties of epitaxial Fe3O4 films with various crystal orientations and tunnel magnetoresistance effect at room temperature
| Title: | Magnetic properties of epitaxial Fe3O4 films with various crystal orientations and tunnel magnetoresistance effect at room temperature |
| Authors: | Nagahama, Taro Browse this author →KAKEN DB | | Matsuda, Yuya Browse this author | | Tate, Kazuya Browse this author | | Kawai, Tomohiro Browse this author | | Takahashi, Nozomi Browse this author | | Hiratani, Shungo Browse this author | | Watanabe, Yusuke Browse this author | | Yanase, Takashi Browse this author | | Shimada, Toshihiro Browse this author |
| Issue Date: | 8-Sep-2014 |
| Publisher: | American Institute of Physics |
| Journal Title: | Applied Physics Letters |
| Volume: | 105 |
| Issue: | 10 |
| Start Page: | 102410 |
| Publisher DOI: | 10.1063/1.4894575 |
| Abstract: | Fe3O4 is a ferrimagnetic spinel ferrite that exhibits electric conductivity at room temperature (RT). Although the material has been predicted to be a half metal according to ab-initio calculations, magnetic tunnel junctions (MTJs) with Fe3O4 electrodes have demonstrated a small tunnel magnetoresistance (TMR) effect. Not even the sign of the tunnel magnetoresistance ratio has been experimentally established. Here, we report on the magnetic properties of epitaxial Fe3O4 films with various crystal orientations. The films exhibited apparent crystal orientation dependence on hysteresis curves. In particular, Fe3O4(110) films exhibited in-plane uniaxial magnetic anisotropy. With respect to the squareness of hysteresis, Fe3O4 (111) demonstrated the largest squareness. Furthermore, we fabricated MTJs with Fe3O4(110) electrodes and obtained a TMR effect of -12% at RT. The negative TMR ratio corresponded to the negative spin polarization of Fe3O4 predicted from band calculations. |
| Rights: | Copyright 2014 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters 105, 102410 (2014); and may be found at http://dx.doi.org/10.1063/1.4894575 |
| Type: | article |
| URI: | http://hdl.handle.net/2115/57532 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 長浜 太郎
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