Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Spin dynamics: Magnetic relaxation and Gilbert damping

MA 31.4: Vortrag

Mittwoch, 3. April 2019, 12:30–12:45, H52

In-situ study of Fe on GaAs (100) and GaAs (110) — •Babli Bhagat, Ralf Meckenstock, and Michael Farle — Center for Nanointegration (CENIDE) and Faculty of Physics, University of Duisburg Essen, Lotharstr. 1, 47057, Duisburg, Germany

Fe films have been intensively studied but there are still some unanswered questions associated to it. We are interested in studying the spin pumping effect in Fe based heterostructures. For that we investigated the growth and stability of 4nm Fe film on GaAs (100) and (110) substrate under ultra high vacuum (UHV) conditions. We have compared the surface reconstruction of Fe film on both substrate orientations in terms of structural and magnetic properties. The films were grown with electron beam evaporation and measured by in-situ Ferromagnetic Resonance (FMR), Low Energy Electron Diffraction (LEED) and Auger Electron Spectroscopy (AES) techniques as a function of time at room temperature. The FMR measurement show island growth in case of Fe\GaAs(110) substrate, which gives two resonance lines with time while on GaAs(100) it formed a flat surface giving a single resonance line with time. The surface roughness was also confirmed by ex-situ Atomic Force Microscopy (AFM) measurements. Thus (100) system has a better surface and interface to study the spin pumping effect in such heterostructures. Further we also did the LEED and AES measurement of Fe\GaAs(100) with time which shows that up-to 8-10 hours the film quality is maintained under the UHV conditions.