Magnetic Anisotropy of Heterojunction Co/MoS₂ Modulation by a Twisted Light
Chun-I Lu1*, Shang-An Wang1, Shih-Chieh Lin1, Chak-Ming Liu1, Wen-Chin Lin1, Ting-Hua Lu1, Yann-Wan Lan1
1Department of Physics, National Taiwan Normal University, Taipei, Taiwan
* Presenter:Chun-I Lu,
The Laguerre-Gaussian beam (also named as twisted light) is a special solution of Maxwell’s Eqs., has been demonstrated that the wavefront is helical, and each photon has orbital angular momentum (OAM) of lℏ.[1] Further, a circular photocurrent could be induced by illuminating a LG beam on the conductive surface.[2] In this report, we explore the feasibility of the magnetization switching by using a twisted light. The twisted light is introduced onto the Co/MoS₂ heterojunction, at which interface Co-S shows the magnetic coupling already.[3] Consequently, we found the hysteresis loops are changed after performing the twisted light. The angular analysis results show that the magnetic anisotropy is also varied after the twisted light illumination. The mechanism is still under exploring; however, our finding opens a possibility for the twisted light applicate on the 2D materials based magnetic related devices.

[1] L. Allen, M. W. Beijersbergen, R. J. Spreeuw, J. P. Woerdman, Phys. Rev. A 45, 8185–8189 (1992).
[2] Ji, Z. et al. Science 368, 763 (2020).
[3] Lu, C.-I. et al. Nanoscale Horiz, 5, 1058-1064 (2020).

This project is financially sponsored by Ministry of Science and Technology of Taiwan
(MOST 108-2112-M-003-010-MY3) and (MOST 109-2811-M-003 -526).

Keywords: 2D materials, TMDCs, MoS2, Heterojunction, XMCD