Heteroepitaxy of Fe3O4/Muscovite: a New Perspective for Flexible Spintronics
Ping-Chun Wu1,2*, Ping-Fan Chen3, Thi Hien Do3, Ying-Hui Hsieh2,4, Chun-Hao Ma5, Duy Thai Ha6, Kun-Hong Wu7, Yu-Jia Wang8, Hao-Bo Li8, Yi-Chun Chen7, Jenh-Yih Juang6, Pu Yu8, Lukas M. Eng4, Chun-Fu Chang1, Po-Wen Chiu5, Liu Hao Tjeng1, Ying-Hao Chu2,3,6
1Chemical Physics of Solids, Max Planck Institute, Dresden, Germany
2Department of Materials Science and Engineering, National Chiao Tung University, National Chiao Tung University, Taiwan
3Institute of Physics, Academia Sinica, Taipei, Taiwan
4Institut fur Angewandte Photophysik, Technische Universitat Dresden, Dresden, Germany
5Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan
6Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan
7Department of Physics, National Cheng Kung University, Tainan, Taiwan
8Department of Physics, Tsinghua University, Beijing, China
* presenting author:Wu Ping-Chun, email:bjwu.mse03g@nctu.edu.tw
Spintronics has captured a lot of attention since it was proposed. It has been triggering numerous research groups to make their efforts on pursuing spin-related electronic devices. Recently, flexible and wearable devices are in a high demand due to their outstanding potential in practical applications. In order to introduce spintronics into the realm of flexible devices, we demonstrate that it is feasible to grow epitaxial Fe3O4 film, a promising candidate for realizing spintronic devices based on the tunneling magnetoresistance, on flexible muscovite. In this study, the heteroepitaxy of Fe3O4/muscovite is characterized by x-ray diffraction, high-resolution transmission electron microscopy, and Raman spectroscopy. The chemical composition and magnetic feature are investigated by a combination of x-ray photoelectron spectroscopy and x-ray magnetic circular dichroism. The electrical and magnetic properties are examined to show the preservation of the primitive properties of Fe3O4. Furthermore, various bending tests are performed to show the tunability of functionalities and to confirm that the heterostructures retain the physical properties under repeated cycles. These results illustrate that the Fe3O4/muscovite heterostructure can be a potential candidate for the applications in flexible spintronics.

Keywords: Heteroepitaxy, Spintronics, Magnetite, Muscovite, Flexible electronics