Interesting Observations in Nano-magnetic Materials
Wen-Chin Lin1*
1Department of Physics, National Taiwan Normal University, Taipei, Taiwan
* presenting author:Wen-Chin Lin,
Due to the nano-scale-size induced quantum effect and the symmetry-breaking induced surface effect, nano-magnetic materials have attracted much attention in recent decades and been shown to reveal various unique magnetic properties. On the other hand, not only in magnetism, numerous emerging nanomaterials also exhibit interesting properties for various applications, such as catalyzed hydrogen dissociation and storage, carbon-based nanomaterials, and transition metal dichalcogenides (TMDs) 2-dimensional layered materials. Since the above-mentioned nanomaterials are mostly not magnetic, we are interested in their combination with magnetic nanomaterials. In this talk, we are going to present our latest studies in NTNU, combining nanomagnetism with other functional nanomaterials, as listed in the following: (1) self-catalyzed hydrogen dissociation and absorption in Pd-related alloys and nanostructures, (2) hybridization-induced considerable magnetization of carbon in Pd-Fe-C60 composite film, (3) individual magnetic behavior of Fe over-layers on few layer MoS2 flakes. Magnetism of Pd-related alloys and nanostructures are extremely sensitive to the presence of hydrogen gas pressure. Surface-Pd-catalyzed hydrogen dissociation and absorption are able to modulate the long-rang magnetic exchange-coupling, induce spin-reorientation transition, and modify the magnetic interlayer-coupling. The pronounced XMCD measured in our Pd-Fe-C60 composite films indicates the possibility to induce magnetism in carbon-based nanomaterials. By using magneto-optical Kerr microscope, we investigated the hysteresis curves of Fe layers on individual MoS2 flake. This study exhibits the possible interaction at Fe/MoS2 interface and its effect on magnetism.

Keywords: Nanomagnetism