Charge and Spin Transferring Between Ferromagnetic Cobalt Ultrathin Films and Monolayer Molybdenum Disulfide

Chun-I Lu^1*, Chih-Heng Huang², Tzu-Hung Chuang¹, Yann-Wen Lan³, Der-Hsin Wei¹

¹Scientific Research Division, National Synchrotron Radiation Research Center, Hsinchu, Taiwan
²Program for Synchrotron Radiation and Neutron Beam Applications, National Sun Yat-sen University, Kaohsiung, Taiwan
³Department of Physics, National Taiwan Normal University, Taipei, Taiwan

* Presenter:Chun-I Lu, email:lu.ci@nsrrc.org.tw

Due to the unique band structures, the potential applications of the transition metal dichalcogenide (TMD) monolayers for spintronic have been wildly studying.[1] First-principles discovered that the spin donation from the Co layer into adjacent MoS₂ monolayer by the charge transfer at the interface.[2] Base on this result, we perform a series of X-ray circular dichroism (XMCD) measurements on this Co/MoS₂ system, and we found the top Co layer forms ferromagnetic domains. Which domain also shows strongly correlated to the bottom MoS₂ lattices. The X-ray photoelectron spectroscopy (XPS) and scanning photoelectron microscopy (SPEM) further provide evidence of the proposing charge transfer. Combining these observations, we suggest that: the spin donation from the Co layer produces the magnetized-MoS₂, and which induces domain patterns of Co. In other words, the charge transferring between Co and MoS₂ is linking the two-layers' magnetic behavior together.

[1] Weiyi Wang, A. Narayan, L. Tang, K. Dolui, Y. Liu, X. Yuan, Y. Jin, Y. Wu, I. Rugger, S. Sanvito, and Faxian Xiu, Nano Lett. 15, 5261 (2015)
[2] T. Garandal, R. Arras, X. Marie, P. Renucci, and L. Calmels, Phys. Rev. B 95, 075402 (2017).

This project is financially sponsored by the Ministry of Science and Technology of Taiwan
(MOST 104-2112-M-213-002-MY3).

Keywords: 2D materials, magnetic domains, heterojunction, synchrotron radiation, XMCD