Effects of layer modulus on the phase evolutions and magnetic properties of [MgO/FePt]n multilayer thin films

• Published in: Applied physics. A, Materials science & processing Vol. 128; no. 12
• Main Authors: Hong, Y., Zeng, Y. P., Qiu, Z. G., Zheng, Z. G., Guo, J. P., Chen, D. Y., Xia, W. X., Zeng, D. C., Liu, J. P.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2022; Springer Nature B.V; Springer Verlag
• Subjects: Annealing; Applied physics; Characterization and Evaluation of Materials; Coercivity; Condensed Matter Physics; Intermetallic compounds; Iron compounds; Machines; Magnesium oxide; Magnetic anisotropy; Magnetic properties; Manufacturing; Materials science; Microelectromechanical systems; Multilayers; Nanotechnology; Optical and Electronic Materials; Physics; Physics and Astronomy; Platinum compounds; Processes; Surfaces and Interfaces; Thin Films; Transformation temperature; multilayer; FePt transformation; L1; Layer modulus; MgO/FePt; Magnetic properties
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-022-06237-x

Multilayer structural system is expected to reduce demagnetization energy and obtain outstanding magnetic anisotropy. The effects of layer modulus (n) on the phase evolutions and magnetic properties of [MgO/FePt] n multilayer thin films were systematically investigated. The low ordering parameters and coercivity when annealing at 600 °C indicated that the existence of the MgO phase would enhance the L1 0 –FePt transformation temperature. When annealing at 800 °C, the coercivity of 9 kOe with a superior in-plane magnetic anisotropy was obtained in [MgO/FePt] 2 multilayer film. This multilayer film has reasonable exchange coupling interactions between the magnetic grains ( α  = 2.4) that could be utilized as an ideal candidate for micro-electro-mechanical systems (MEMS).