Seminar: "Towards novel 2D material systems for spintronic and nanoscale electronic applications with SPEX" (Lecture)
- Thursday 17 January 2019Add to my calendar
- from 12:30
Mercator 1, 00.28
dr. Nadine Hauptmann (Scanning Probe Microscopy)
Over a decade ago, the discovery of graphene has boosted the research on 2D materials. Owing to their restriction to one layer, new and fascinating quantum mechanical effects emerge in these materials that can be utilized in macroscopic devices, holding promising potential for nanoscale electronic devices. However, graphene is a semimetal with no electronic band gap and it is difficult to induce magnetism. Both properties make it less ideal for applications. Therefore, new classes of semiconducting 2D materials became interesting that can account for these drawbacks, e. g. transition metal dichalcogenides. In addition, atomic-scale noncollinear magnetic structures, such as skyrmions, have become hot candidates for future data storage devices. However, characterization of the atomic-scale electronic and magnetic properties of semiconducting 2D materials and atomic-scale magnetic structures with the state-of-the-art method, spin-polarized scanning tunneling microscopy (SP-STM), is rather challenging due to methodological limitations. To go beyond these limitations, I have developed a new type of microscope which combines atomic-scale spin detection utilizing spin-polarization as well as magnetic exchange interaction (SPEX), in collaboration with the SPM department at the IMM. I will present our proof-of-principle studies that reveal of the power of SPEX: (i) high-resolution magnetic imaging of noncollinear magnetic structures, (ii) detection of different magnetic exchange regimes, as well as (iii) decomposition of the geometric and electronic/magnetic structure. I will illustrate my vision of using SPEX for characterization and designing new 2D materials, i. e. 2D semiconductors and 2D ferromagnets, which are currently hot research topics owing to their high potential for energy-efficient spintronic and nanoscale electronic devices.
prof. Herma Cuppen