Formation mechanism of rhombohedral L11 phase in CoPt films grown on glass substrate

Authors

Ying Gao, Tokyo Institute Of Technology
Haifeng Feng, University of WollongongFollow
Ningyan Cheng, University of WollongongFollow
Yi Du, University of WollongongFollow
Takashi Harumoto, Tokyo Institute Of Technology
Yoshio Nakamura, Tokyo Institute Of Technology
Ji Shi, Tokyo Institute Of Technology

RIS ID

130838

Publication Details

Gao, Y., Feng, H., Cheng, N., Du, Y., Harumoto, T., Nakamura, Y. & Shi, J. (2019). Formation mechanism of rhombohedral L11 phase in CoPt films grown on glass substrate. Journal of Magnetism and Magnetic Materials, 471 406-410.

Abstract

L11-CoPt(1 1 1) films were successfully fabricated on glass substrates at 300-400 °C, using Pt(1 1 1) underlayer. Magnetocrystalline anisotropy energy shows a maximum of 1.8 x 106J/m3at 350 °C. The mechanism of L11-CoPt ordering after introducing Pt underlayer is considered to be strain- or stress-induced ordering. The effect of CoPt layer thickness on phase structure and magnetic properties were investigated to confirm the ordering mechanism. Perpendicular magnetic anisotropy has been obtained in all CoPt films, while the squareness ratio and coercivity decrease with increasing film thickness, indicating decreased ordering due to the relaxation of strain or stress in thick films.