Hydrogenation effect on magnetic single domains of high-temperature-deposited uniform CoxPd1-x/MoS2 flakes

Chak Ming Liu^1*, Chuan-Che Hsu¹, Wen-Chin Lin¹

¹Department of physic, National Taiwan Normal University, Taipei, Taiwan

* Presenter:Chak Ming Liu, email:edward2010619@gmail.com

In this study, 6-nm CoxPd1-x alloy films were deposited on MoS2 flakes at a high temperature (HT) of 200 °C. The morphology and magnetic properties of these flakes was studied. In contrast to the nanoparticle assembly fabricated through room-temperature deposition, HT growth led to a relatively uniform coverage on MoS2 flakes with a roughness of less than 1 nm. The flat CoxPd1-x alloy films form magnetic single domains on individual MoS2 flakes. For 6-nm Co0.5Pd0.5 and Co0.35Pd0.65, the magnetic coercivity (Hc) was approximately 50 Oe. Co0.5Pd0.5/MoS2 exhibited more distinct azimuthal angle–dependent magnetic behavior than that of Co0.35Pd0.65/MoS2. The different angle-dependent Hc variation for various MoS2 flakes could be attributed to the shape and demagnetization effect at the edge. After hydrogen exposure, the Hc of Co0.5Pd0.5/MoS2 was enhanced by 30% ± 10% and the magnetic domains extended over the MoS2 flakes, which indicated that H-absorption in Co0.5Pd0.5 bridges magnetic coupling across the MoS2 edge.

Keywords: MoS2 flakes, magnetic single domains, Hydrogenation effect