Understanding magnetic properties of arrays of small FePt dots with perpendicular anisotropy
| Autor: | S. Takahashi, Z.J. Yan, Takashi Hasegawa, Desheng Xue, J. Ariake, Shunji Ishio, Y. Kondo |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Condensed matter physics Annealing (metallurgy) Dot array Coercivity Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Volume fraction Perpendicular Perpendicular anisotropy Anisotropy |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 324:3737-3740 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2012.06.006 |
| Popis: | FePt dot arrays with dot size down to 15 nm are fabricated by film annealing and patterning. The array coercivity shows an increase with dot size decreasing from 100 to 30 nm, and a slight reduction for the 15 nm dot sample. Annealing these dot arrays at higher temperatures results in large enhancements in the coercivities, except the 15 nm dot array where the coercivity increases a little. Micromagnetic models of a 15 nm FePt dot with uniform and nonuniform edges of soft magnetic defects and with inside defects are calculated to reveal the microstructure origins of the dot magnetic properties. It is found that the volume fraction of the L 1 0 -phase FePt with perpendicular c -axis orientation is about 50% in the dot and the switching field distribution of the dot array can be influenced significantly by the defect arrangement in the dots. |
| Databáze: | OpenAIRE |
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