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Spintronics/Spin-Plasmonics Group

Junior Research Group - Group Leader: Jun.-Prof. Dr. Evangelos Papaioannou

Members

On photo from left to right: Hauke Georg Schäfer (research assistant), Laura Scheuer (diploma student), Sascha Keller (PhD student), Ellen Wiedemann (diploma student), Jochen Greser (research assistant), Matthias Schweizer (diploma student), Dr. Spyridon Pappas (postdoc), Philipp Lang (diploma student), Jun.-Prof. Dr. Evangelos Papaioannou (head of the group).

Scientific research fields

-Spintronics: Our aim is to control the magneto-electric spin conversion in magnetic heterostructures by means of atomically controlled interfaces. We focus on the spin pumping effect, spin Hall effect and inverse spin Hall effect for the generation and conversion of spin accumulations and pure spin currents.

-Spin-plasmonics: our goal is to bring together the fields of Magnonics and Plasmonics. We investigate the emergent properties due to interactions between two collective excitations: plasmons (induced by optical near fields) and magnons. We aim on: (i) the manipulation of magneto-plasmon interaction i.e. the manipulation of surface plasmon properties through the use of magnetic materials and external magnetic fields; (ii) the manipulation of magnon properties by using localized and propagating surface plasmons.

Experimental Methods

To achieve our goals, we use our expertise in materials science and in magnetization dynamics. We focus on the epitaxial growth of thin films and multilayers by molecular beam epitaxy and sputtering techniques. The structural and magnetic properties are studied via in-situ structural (LEED, REED, STM) and in-situ magnetic (MOKE-BLS) characterization techniques. Furthermore ex-situ techniques like XRD, XRR, AFM for the structural part and BLS, Spectroscopic-MOKE, FMR, Angular resolved spin pumping, MFM for the magnetic part are in our disposal.

Teaching: University Courses

Nanotechnologie I

Nanotechnologie II

Magnetophotonics and Magneto-optical spectroscopy

Advanced Experimental methods for structural and magnetic characterization of nanostructures

Publications

Submitted

  1. Efficient Spintronic Terahertz Emitters Based on Epitaxial Grown Fe/Pt Layer Structures
    Garik Torosyan, Sascha Keller, Laura Scheuer, Rene Beigang and Evangelos Th. Papaioannou
    arXiv:1707.08894
  2. Understanding magneto-optics at the geometrical percolation limit: the role of hot-spots in the magneto-plasmonic interaction
    Evangelos Th. Papaioannou, Hui Fang, Blanca Caballero, Eser Metin Akinoglou, Michael Giersig, Antonio García-Martín, and Paul Fumagalli

In Press

    Published 2016-2017

    1. Relative weight of the inverse spin-Hall and spin-rectification effects for metallic polycrystalline Py/Pt, epitaxial Fe/Pt, and insulating YIG/Pt bilayers: Angular dependent spin pumping measurements
      S. Keller, J. Greser, M. R. Schweizer, A. Conca, V. Lauer, C. Dubs, B. Hillebrands,
      and E. Th. Papaioannou
      Phys. Rev. B 96, 024437 (2017)
    2. Spin-pumping through a varying-thickness MgO interlayer in Fe/Pt system
      L. Mihalceanu, S. Keller, J. Greser, D. Karfaridis, K. Symeonidis, G. Vourlias, T. Kehagias, A. Conca,
      B. Hillebrands, and E. Th. Papaioannou
      Appl. Phys. Lett. 110, 252406 (2017)
    3. Lack of correlation between the spin mixing conductance and the ISHE-generated voltages in CoFeB/Pt,Ta bilayers
      A. Conca, B. Heinz, M. R. Schweizer, S. Keller, E. Th. Papaioannou, and B. Hillebrands
      Phys. Rev. B 95, 174426 (2017)
    4. Study of fully epitaxial Fe/Pt bilayers for spin pumping by ferromagnetic resonance spectroscopy
      A. Conca, S. Keller, L. Mihalceanu, T. Kehagias, G. P. Dimitrakopulos, B. Hillebrands,
      and E. Th. Papaioannou
      Phys. Rev. B 93, 134405 (2016)
    5. Light Localization and Magneto-Optic Enhancement in Ni Antidot Arrays
      M. Rollinger, P. Thielen, E. Melander, E. Östman, V. Kapaklis, B. Obry, M. Cinchetti, A. García-Martín, M. Aeschlimann, and E. Th. Papaioannou
      Nano Letters 16, 2432 (2016)