MBI Staff Member – Personal info

Position

Project Member 3.2 "Solids and Nanostructures: Electrons, Spins, and Phonons"

Research

My research work focuses on femtosecond laser-induced ultrafast spin, lattice and charge processes in condensed matter in order to drive ultrafast magnetic phase transitions and spin switching phenomena. In particular, we seek to understand and eventually control the magnetic order at the nanoscale with femtosecond time resolution. To achieve these goals we follow a two-fold experimental approach:
(1) We employ resonant and selective photo-excitations in magnetically ordered materials at photon energies ranging from THz (meV) to soft X-ray (keV) spectral range in order to drive ultimately fast magnetic phenomena (see Figure).
(2) Using element-, quasiparticle- an mode-specific probing techniques we are able to directly measure and disentangle the subsequent dynamics of each constituent sub-system, i.e. electrons, lattice, spins, on their characteristic time- and length-scales.

Curriculum vitae

since 2016 Senior Scientist, Max-Born Institute Berlin

2015-2015 Senior Scientist, Technical University Berlin and Helmholtz Zentrum Berlin – BESSY II

2012-2015 Group Leader ‘Ultrafast Magnetism on Elemental Time and Length Scales’, Helmholtz Zentrum Berlin – BESSY II

2008-2012 Postdoctoral Research Associate, Prof. Dr. Theo Rasing, Radboud University Nijmegen, Netherlands

2006-2008 Postdoctoral Research Associate, Prof. Dr. Christian Back, Regensburg University, Germany

2006Ph.D. in the group of Prof. Dr. Martin Wolf at the Free University Berlin, Germany

2001 M.Sc., Physics, West University of Timisoara, Romania and Free University Berlin, Germany

1999 B.Sc., Physics, West University of Timisoara, Romania

MBI Publications

  1. Angular Momentum Flow during Ultrafast Demagnetization of a Ferrimagnet

    M. Hennecke, I. Radu, R. Abrudan, T. Kachel, K. Holldack, R. Mitzner, A.Tsukamoto, S. Eisebitt

    Physical Review Letters 122 (2019) 157202/1-5
  2. Dissecting spin-phonon equilibration in ferrimagnetic insulators by ultrafast lattice excitation

    S. F. Mährlein, I. Radu, P. Maldonado, A. Paarmann, M. Gensch, A. M. Kalashnikova, R. V. Pisarev, M. Wolf, P. M. Oppeneer, J. Barker, T. Kampfrath

    Science Advances 4 (2018) 5164/1-7
  3. Selective THz control of magnetic order: new opportunities from superradiant undulator sources

    S. Kovalev, Zhe Wang, J.-C. Deinert, N. Awari, M. Chen, B. Green, S. Germanskiy, T. V. A. G. de Oliveira, S. Lee, A. Deac, D. Turchinovich, N. Stojanovic, S. Eisebitt, I. Radu, S. Bonetti, T. Kampfrath, M. Gensch

    Journal of Physics D-Applied Physics 51 (2018) 114007/1-8
  4. Generating circularly polarized radiation in the extreme ultraviolet spectral range at the free-electron laser FLASH

    von Korff Schmising, C., D. Weder, T. Noll, B. Pfau, M. Hennecke, C. Strüber, I. Radu, M. Schneider, S. Staeck, C. M. Günther, J. Lüning, A. el dine Merhe, J. Buck, G. Hartmann, J. Viefhaus, R. Treusch, S. Eisebitt

    Review of Scientific Instruments 88 (2017) 053903 /1-9
  5. Laser-Induced Ultrafast Magnetic Phenomena

    K. Carva, P. Baláž, I. Radu

    Handbook of Magnetic Materials Elsevier B.V (2017) 291-463
  6. Terahertz spin currents and inverse spin Hall effect in thin-film heterostructures containing complex magnetic compounds

    T. Seifert, U. Martens, S. Günther, M. A. W. Schoen, F. Radu, X. Z. Chen, I. Lucas, R. Ramos, M. H. Aguirre, P. A. Algarabel, A. Anadón, H. S. Körner, J. Walowski, C. Back, M. R. Ibarra, L. Morellón, E. Saitoh, M. Wolf, C. Song, K. Uchida, M. Münzenberg, I. Radu, T. Kampfrath

    SPIN 7 (2017) 1740010/1-11
  7. Magnetization compensation and spin reorientation transition in ferrimagnetic DyCo5: Multiscale modeling and element-specific measurements

    A. Donges, S. Khmelevskyi, A. Deak, R.-M. Abrudan, D. Schmitz, I. Radu, F. Radu, L. Szunyogh, U. Nowak

    Physical Review B 96 (2017) 024412/1-7
  8. Analysis of the halo background in femtosecond slicing experiments

    D. Schick, L. Le Guyader, N. Pontius, I. Radu, T. Kachel, R. Mitzner, T. Zeschke, C. Schüßler-Langeheine, A. Föhlisch, K. Holldack

    Journal of Synchrotron Radiation 23 (2016) 700-711
  9. Structural and magnetic characterization of large area, free-standing thin films of magnetic ion intercalated dichalcogenides Mn0.25TaS2 and Fe0.25TaS2

    T. Danz, Q. Liu, X. D. Zhu, L. H. Wang, S. W. Cheong, I. Radu, C. Ropers, R. I. Tobey

    Journal of Physics-Condensed Matter 28 (2016) 356002/1-6
  10. Probing ultrafast spin dynamics with high-harmonic magnetic circular dichroism spectroscopy

    F. Willems, C. T. L. Smeenk, N. Zhavoronkov, O. Kornilov, I. Radu, M. Schmidbauer, M. Hanke, von Korff Schmising, C., M. J. J. Vrakking, S. Eisebitt

    Physical Review B 92 (2015) 220405(R)/1-5