Fachbereich Physik

Arbeitsgruppe Prof. Hillebrands

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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: Matthias Schweizer (diploma student), Ulaş Ören (diploma student), Laura Scheuer (diploma student), Sascha Keller (PhD student), Philipp Lang (diploma student), Dr. Spyridon Pappas (postdoc), Jun.-Prof. Dr. Evangelos Papaioannou (head of the group).

Scientific research fields:

-Spintronics/THz 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.

Publications

Submitted

    Broadband enhancement of the magneto-optical activity of hybrid Au loaded Bi:YIG
    S. D. Pappas, P. Lang, T. Eul, M. Hartelt, A. García-Martín, B. Hillebrands, M. Aeschlimann, E. Th. Papaioannou
    arXiv:1905.11941

    Enhanced performance of spintronic terahertz emitters based on defect engineering
    S. Keller, D. M. Nenno, G. Torosyan, L. Scheuer, M. Battiato, J. Lösch, A. Brodyanski, R. H. Binder, H. C. Schneider, R. Beigang, and E. Th. Papaioannou
    arxiv:1901.10011

    Efficient terahertz generation using Fe/Pt spintronic emitters pumped at 400, 800 ad 1500 nm wavelengths
    R. Beigang, E. Th. Papaioannou, L. Scheuer, S. Keller, G. Torosyan, M. Rahm, D. Sokuluk, M. Talar, Y. Oda, H. Kitahara, J. Afalla, V. K. Magusara, and M. Tani

    Influence of the Pt thickness on the structural and magnetic properties of ultra-thin Fe/Pt bilayers
    D. Karfaridis, L. Mihalceanu, S. Keller, K. Simeonidis, G. P. Dimitrakopulos, Th. Kehagias, E. Th. Papaioannou, G. Vourlias

    A Microscopic Explanation of Microwave Spin Pumping
    John F. Gregg, Burkard Hillebrands, Alistair Inglis, Monika E. Mycroft, Evangelos Th. Papaioannou, James Semple, Calvin J. Tock
    arxiv:1711.06048v2

In Press

    Published

      (2019)
      Thickness dependent enhancement of the polar Kerr rotation in Co magnetoplasmonic nanostructures
      R. M. Rowan-Robinson, E. Melander, I.-A. Chioar, B. Caballero, A. Garcia-Martin, E. Th. Papaioannou, and V. Kapaklis,
      AIP Advance 9, 025317 (2019)

      (2018)
      Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance
      A. Conca, S. Keller, M. R. Schweizer, E. Th. Papaioannou, and B. Hillebrands
      Phys. Rev. B 98, 214439 (2018)

      Efficient Terahertz Generation Using Fe/Pt Spintronic Emitters Pumped at Different Wavelengths
      E. Th. Papaioannou, G. Torosyan, S. Keller, L. Scheuer, M. Battiato, V. K. Mag-usara, J. L'huillier, M. Tani, R. Beigang
      IEEE Trans. Mag. 54, 9100205 (2018)

      Determination of the spin Hall angle in single-crystalline Pt films from spin pumping experiments
      S. Keller, L. Mihalceanu, M. R. Schweizer, P. Lang, B. Heinz, M. Geilen, T. Brächer, P. Pirro, T. Meyer, A. Conca, D. Karfaridis, G. Vourlias, T. Kehagias, B. Hillebrands, E. Th. Papaioannou
      New J. Phys. 20, 053002 (2018)

      Optimized spintronic terahertz emitters based on epitaxial grown Fe/Pt layer structures
      G. Torosyan, S. Keller, L. Scheuer, R. Beigang, E. Th. Papaioannou
      Sci. Rep. 8, 1311 (2018)

      (2017)
      Role of interactions in the magneto-plasmonic response at the geometrical threshold of surface continuity
      E. Th. Papaioannou, H. Fang, B. Caballero, E. Metin Akinoglou, M. Giersig, A. García-Martín, and P. Fumagalli
      Optics Express 25, 32792 (2017)

      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)

      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)

      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)

      (2016)
      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)

      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)

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