Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8157063 | Journal of Magnetism and Magnetic Materials | 2014 | 5 Pages |
Abstract
Co49Pt51 alloy films with strong perpendicular magnetic anisotropy (PMA) have been most often grown on either single crystal or glass substrates with deposition temperature of about 350 °C using Pt/Ru as an underlayer. In contrast, in this study, 5-nm thick Co49Pt51 alloy films with significant PMA were fabricated on glass substrates at room temperature (RT) using a combination of Ta and Pt underlayers. The structural and magnetic properties of the Co49Pt51 films obtained at RT (RT-CoPt) were compared with that of those produced by the conventional high-temperature route (HT-CoPt). The x-ray diffraction studies showed the evolution of highly textured Pt (111) peak accompanied by a CoPt (222) shoulder for the RT-CoPt films, similar to that of the HT-CoPt films. The microstructural studies revealed extremely smooth surface with root mean square roughness (Rrms) of 0.5 nm for the RT-CoPt films, while the HT-CoPt films showed wavy surface with Rrms of 2.4 nm. The out-of-plane and in-plane hysteresis loops demonstrated the existence of strong PMA for both the RT-CoPt and HT-CoPt films. The estimated magnetic parameters for the RT-CoPt films such as squarness ratio, SQR (0.96), perpendicular coercivity, Hc⥠(822 Oe) and magneto-crystalline anisotropy constant, Ku (6.4Ã106 erg/cm3) was found to be comparable to that of those obtained with the HT-CoPt films (SQR=0.96, Hcâ¥=1810 Oe and Ku=7.1Ã106 erg/cm3).
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
C.-Y. Tsai, P. Saravanan, Jen-Hwa Hsu, C.-Y. Kuo, K.-F. Lin,