We present the effect of multilayer deposition on the magnetic properties of MnBi thin films. The multilayered MnBi films were fabricated with alternating deposition of Bi and Mn with N (N = 2–10) layers (L), followed by in situ thermal annealing. As N increases, the even-layered and odd-layered films show a similar layer-number-dependence of the magnetic properties, such as an increasing behavior for H c and a concave-up behavior for M r and (BH) max . Higher magnetic properties were obtained at 9L and 10L. According to the electron microscopy analyses, different morphologies and elemental distributions were observed at different N (e.g., smooth-surfaced MnBi film with Bi islands at 2L and uneven-surfaced MnBi film at 10L). The different distributions of microstructure and chemical components are associated with the layer-dependent magnetic properties of the MnBi films.
Bibliographical noteFunding Information:
This work was supported by the Priority Research Centers Program (grant number 2009-0093823) through the National Research Foundation of Korea (NRF). H-S Lee thanks to the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2015R1C1A2A01055702). The authors thank Cheol-Hwee Shim for his technical support and expert operation of the Tecnai TEM and Hye-Young Hyun for TEM sampling using the Nova 600 FIB at the Advanced Analysis Center at the Korea Institute of Science and Technology.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Surfaces, Coatings and Films