| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Thin Films | Tuesday Sessions |
| Session TF-TuM |
| Session: | Innovations in the Development of Multifunctional Thin Films |
| Presenter: | Valeria Lauter, Oak Ridge National Laboratory, USA |
| Correspondent: | Click to Email |
New functionality often arises at the mesoscale where defects, interfaces, and non-equilibrium structures are formed [1]. Probing the internal structure morphology and spin structure in thin films and nanostructured materials via Polarized Neutron Reflectometry (PNR) is a type of experiments addressing not only a kind of “surface visualization” or integration over the whole sample size. PNR is a tool providing depth resolved information and establishes a direct and precise correlation between local interfacial characteristics and global physical properties and delivers the most exhaustive and detailed information on the 3-dimensional structure of thin films and hidden interfaces on enormous length scale [2]. In this talk I will present a spectrum of experiments performed at the Magnetism Reflectometer at the Spallation Neutron Source, that covers multiple scientific areas, e.g. new generation of heterostructures based on integrating topological insulators (TIs) with conventional materials to induce ferromagnetic interactions with symmetry breaking at the interface [3], tunnel barriers in hybrid organic/metallic spin-valve structures, asymmetric block-copolymer/nanoparticle composite structures. The specific details will be presented.
Research at Oak Ridge National Laboratory’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, and the US Department of Energy, by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory.
[1] From Quanta to the Continuum: Opportunities for Mesoscale Science, a report from the Basic Energy Sciences Advisory Committee (2012)
http://science.energy.gov/~/media/bes/pdf/reports/files/From_Quanta_to_the_Continuum_rpt.pdf
[2] V. Lauter, H.J.C. Lauter, A. Glavic, B. Toperverg, "Reflectivity, Off-Specular Scattering, and GISANS Neutrons," book chapter in Reference Module Material Science Elsevier, 2016
[3] F. Katmis, V. Lauter, F. Nogueira, B. Assaf, M. Jamer, P. Wei, B. Satpati, J. Freeland, I. Eremi, D. Heiman, P. Jarillo-Herrero, J. Moodera, “Achieving high-temperature ferromagnetic topological insulating phase by proximity coupling”, Nature 2016, 533, 513