Martin Luther University Halle-Wittenberg

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Institut für Physik
Fachgruppe Optik

phone: 0345 55-25301
fax: 0345 55-27221

room 1.34.0
Von-Danckelmann-Platz 3
06120 Halle (Saale)

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Optics Group

Welcome to the web page of the optics and time resolved spectrocopy group

The Optics group focusses on spin dynamics and spin transport on small time and length scales. Most of the experiments involve optical methods. In addition to the time resolved optical methods the samples preparation (growth and nano patterning) of most samples is also performed in our group. Current research topics are for instance the spin Hall effect in metallic multilayers and the electrical control of magnetization dynamics in dielctric/ferromagnet hybrid systems. The goal is an improved understanding of fundamental processes in order to allow the development of novel spintronic devices.

recent publications

Atomic Scale Control of Spin Current Transmission at Interfaces
M.A. Wahada, E.
Şaşıoğlu, W. Hoppe, X. Zhou, H. Deniz, R. Rouzegar, T. Kampfrath, I. Mertig, St. Parkin, G. Woltersdorf

http://dx.doi.org/10.1021/acs.nanolett.1c04358    
ACS Applied Nano Lett. 9, 3 (2022)

Frequency multiplication by collective nanoscale spin-wave dynamics  Ch. Körner, R. Dreyer, M. Wagener, N. Liebing, HG. Bauer, G. Woltersdorf

http://dx.doi.org/10.1126/science.abm6044     Science 375 (6585), 1165-1169 (2022)

Lost magnetism pinned on atomic rotations
G. Woltersdorf

http://dx.doi.org/10.1038/d41586-022-00189-1
   
Nature 602 (7895), 36-38 (2022)

Crystallographic  dependence of the spin Hall angle in epitaxial Pt   films: Comparison of  optical and electrical detection of spin-torque ferromagnetic resonance  techniques
B. Grover, BK. Hazra, TP. Ma, B. Pal, N. Bernstein, A. Rothschild, AK. Srivastava, S. Choudhury, G. Woltersdorf, A. Capua, SSP. Parkin

http://dx.doi.org/10.1063/5.0085818    
Appl. Phys. Lett. 120, 172406 (2022)

Plasmonic spin-Hall effect of propagating surface plasmon polaritons in Ni80Fe20 microstructures
M. Paleschke, CT. Chiang, L. Brandt, N. Liebing, G. Woltersdorf, W. Widdra

http://dx.doi.org/10.1088/1367-2630/ac1c83
   
New Journal of Physics 23 (9), 093006 (2021)

Effective exchange interaction for terahertz spin waves in iron layers
L. Brandt, U. Ritzmann, N. Liebing, M. Ribow, I. Razdolski, P. Brouwer, A. Melnikov, and G. Woltersdorf

http://dx.doi.org/10.1103/PhysRevB.104.094415    
Phys. Rev. B 104 (9), 094415 (2021)

Modulating the polarization of broadband terahertz pulses from a spintronic emitter at rates up to 10 kHz
O. Gueckstock, L. Nadvornik, TS. Seifert, M. Borchert, G. Jakob, G. Schmidt, G. Woltersdorf, M. Klaeui, M. Wolf, T. Kampfrath

http://dx.doi.org/10.1364/OPTICA.430504
   
Optica 8 (7), 1013-1019 (2021)

On-Chip Generation of Ultrafast Current Pulses by Nanolayered Spintronic Terahertz Emitters
W. Hoppe, J. Weber, S. Tirpanci, O. Gueckstock, T. Kampfrath, G. Woltersdorf

http://dx.doi.org/10.1021/acsanm.1c01449    
   
ACS Applied Nano Materials 4 (7), 7454-7460 (2021)

Spin-wave localization and guiding by magnon band structure engineering in yttrium iron garnet
R. Dreyer, N. Liebing, E.R.J. Edwards, A. Mueller, G. Woltersdorf
Phys. Rev. Materials 5, 064411 (2021)   

Electric-Field Control of Propagating Spin Waves by Ferroelectric Domain-Wall Motion in a Multiferroic Heterostructure
HJ. Qin, R. Dreyer, G. Woltersdorf, T. Taniyama, S. van Dijken
Advanced Materials, 2100646 (2021)    

Broadband Terahertz Probes of Anisotropic Magnetoresistance Disentangle Extrinsic and Intrinsic Contributions
L. Nadvornik, M. Borchert, L. Brandt, R. Schlitz, K. A. de Mare, K. Vyborny, I. Mertig, G. Jakob, M. Klaeui, S.T.B. Goennenwein, M. Wolf, G. Woltersdorf, T. Kampfrath
Physical Review X 11, 021030 (2021)    

Nanoscale magnonic Fabry-Perot resonator for low-loss spin-wave manipulation
HJ Qin, R. B. Hollander, L. Flajsman, F. Hermann, R. Dreyer, G. Woltersdorf, S. van Dijken
Nature Communications 12, 2293 (2021)    

Frequency-Independent Terahertz Anomalous Hall Effect in DyCo5, Co32Fe68, and Gd27Fe73 Thin Films from DC to 40 THz
T. S. Seifert, U. Martens, F. Radu, M. Ribow, M. Berritta, L. Nadvornik, R. Starke, T. Jungwirth, M. Wolf, I. Radu, M. Muenzenberg, P. M. Oppeneer, G. Woltersdorf, T. Kampfrath
Advanced Materials 33, 202007398 (2021)    

Terahertz Spin-to-Charge Conversion by Interfacial Skew Scattering in Metallic Bilayers   
O.
Gueckstock, L. Nadvornik, M. Gradhand, T. S. Seifert, G. Bierhance, R. Rouzegar, M. Wolf, M. Vafaee, J. Cramer, M. A. Syskaki, G. Woltersdorf, I. Mertig, G. Jakob, M. Klaeui, T. Kampfrath
Advanced Materials 33, 2006281 (2021)    

Integration and characterization of micron-sized YIG structures with very low Gilbert damping on arbitrary substrates

P. Trempler,  R. Dreyer, P. Geyer, C. Hauser, G. Woltersdorf, G. Schmidt
Applied Physics Letters 117, 232401 (2020)    

Doping-induced spin Hall ratio enhancement in A15-phase, Ta-doped beta-W thin films
M. Z. Minhas, A. K. Pandeya, B. Grover, A. Fumarola, I. Kostanovskiy, B. K. Hazra, W. Hoppe, G. Woltersdorf, A. Bedoya-Pinto, S.S.P. Parkin, M. N. Ali
Journal of Physics: Materials 3, 044001 (2020)    

Magnonic Magnetoelectric Coupling in Ferroelectric/Ferromagnetic Composites
L. Chotorlishvili, CL. Jia, D. A. Rata, L. Brandt, G. Woltersdorf, J. Berakdar
Physica Status Solidi B 257, 1900750 (2020)    

Direct observation of coherent magnons with suboptical wavelengths in a single-crystalline ferrimagnetic insulator

J. Foerster, J. Graefe, J. Bailey, S. Finizio, N. Traeger, F. Gross, S. Mayr, H. Stoll, C. Dubs, O. Surzhenko, N. Liebing, G. Woltersdorf, J. Raabe, M. Weigand, G. Schuetz, S. Wintz
Physical Review B 100, 214416 (2019)    

Monocrystalline Freestanding Three-Dimensional Yttrium-Iron-Garnet Magnon Nanoresonators
F.
Heyroth, C. Hauser, P. Trempler, P. Geyer, .F Syrowatka, R. Dreyer, S. G. Ebbinghaus, G. Woltersdorf, G. Schmidt
Physical Review Applied 12, 054031 (2019)    

Ferromagnetic Resonance with Magnetic Phase Selectivity by Means of Resonant Elastic X-Ray Scattering on a Chiral Magnet
S.
Poellath, A. Aqeel, A. Bauer, C. Luo, H. Ryll, F. Radu, C. Pfleiderer, G. Woltersdorf, C. H. Back
Physical Review Letters 123, 167201 (2019)    

Magneto-optical properties of Au upon the injection of hot spin-polarized electrons across Fe/Au(001) interfaces
A. Alekhin, I. Razdolski, M. Berritta, D. Buerstel, V. Temnov, D. Diesing, U. Bovensiepen, G. Woltersdorf, P. M. Oppeneer, A. Melnikov
Journal of Physics: Condensed Matter 31, 124002 (2019)    

Femtosecond formation dynamics of the spin Seebeck effect revealed by terahertz spectroscopy
T. S. Seifert, S. Jaiswal, J. Barker, S. T. Weber, I. Razdolski, J. Cramer, O. Gueckstock, S. F. Maehrlein, L. Nadvornik, S. Watanabe, C. Ciccarelli, A. Melnikov, G. Jakob, M. Muenzenberg, S.T.B. Goennenwein, G. Woltersdorf, B. Rethfeld, P. W. Brouwer, M. Wolf, M. Klaeui, T. Kampfrath
Nature Communications 9, 2899 (2018)    

Spin-hall-active platinum thin films grown via atomic layer deposition
R.
Schlitz,  A. A. Amusan, M. Lammel, St. Schlicht, T. Tynell, J. Bachmann, G. Woltersdorf, K. Nielsch, S. T. B. Goennenwein, A. Thomas
Applied Physics Letters 112, 242403 (2018)    

Crystallization behavior of precision polymers containing azobenzene defects
C.
Appiah, G. Woltersdorf, R. A. Perez-Camargo, A. J. Mueller, W. H. Binder
European Polymer Journal 97, 299-307 (2017)    

Synthesis of photoresponsive main-chain oligomers with azobenzene  moieties via ADMET oligomerization and their micellization properties
C.
Appiah, G. Woltersdorf, W. H. Binder,
Polymer Chemistry 8, 2752-2763 (2017)    

Terahertz-Driven Nonlinear Spin Response of Antiferromagnetic Nickel Oxide
S.
Baierl, J. H. Mentink, M. Hohenleutner, L. Braun, T.-M. Do, C. Lange, A. Sell, M. Fiebig, G. Woltersdorf, T. Kampfrath, R. Huber
Physical Review Letters 117, 197201 (2016)    

Observation of orbital two-channel Kondo effect in a ferromagnetic L1(0)-MnGa film
L.
Zhu, G. Woltersdorf, J. H. Zhao
Scientific Reports 6, 34549 (2016)    

Three-dimensional Character of the Magnetization Dynamics in  Magnetic Vortex Structures: Hybridization of Flexure Gyromodes with Spin  Waves   
M.
Noske, H. Stoll, M. Faehnle, A. Gangwar, G. Woltersdorf, A. Slavin, M. Weigand, G. Dieterle, J. Foerster, C. H. Back
Physical Review Letters 117, 037208 (2016)    

Composition-tuned magneto-optical Kerr effect in L1(0)-MnxGa films with giant perpendicular anisotropy
L. J.
Zhu, L. Brandt, J. H. Zhao, G. Woltersdorf
Journal of Applied Physics 49, 245001 (2016)    

Spin wave mediated unidirectional vortex core reversal by two  orthogonal monopolar field pulses: The essential role of  three-dimensional magnetization dynamics
M. Noske, H. Stoll, M. Faehnle, A. Gangwar, G. Woltersdorf, A. Slavin, M. Weigand, G. Dieterle, J. Foerster, C. H. Back, Christian
Journal of Applied Physics 119, 173901 (2016)    

Switching probabilities of magnetic vortex core reversal studied by table top magneto optic Kerr microscopy
G. Dieterle, A. Gangwar, J. Graefe, M. Noske, J. Foerster, G. Woltersdorf, H. Stoll, C. H. Back, G. Schuetz
Applied Physics Letters 108, 022401 (2016)    

Nonlinear spin-wave excitations at low magnetic bias fields

Hans G. Bauer, Peter Majchrak, Torsten Kachel, Christian H. Back, and Georg Woltersdorf
Nature Communications 6, 8274 (2015)   

Spin pumping in YIG/Pt bilayers as a function of layer thicknessM. Haertinger, C. H. Back, J. Lotze, M. Weiler, S. Geprägs, H. Huebl, S. T. B. Goennenwein, and G. Woltersdorf
Physical Review B 92, 054437 (2015)   

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonanceG.B.G. Stenning, L.R. Shelford, S.A. Cavill, F. Hoffmann, M. Haertinger, T. Hesjedal, G. Woltersdorf, G.J. Bowden, S.A. Gregory, C.H. Back, P.A.J. de Groot and G. van der Laan
New Journal of Physics 17, 013019 (2015)   

Extremely Nonperturbative Nonlinearities in GaAs Driven by Atomically Strong Terahertz Fields in Gold Metamaterials
C. Lange, T. Maag, M. Hohenleutner,  S. Baierl, O. Schubert, E.R.J. Edwards, D. Bougeard, G. Woltersdorf and R. Huber]
Physical Review Letters 113, 227401 (2014)    

Unidirectional sub-100-ps magnetic vortex core reversal
M. Noske, A. Gangwar, H. Stoll, M. Kammerer, M. Sproll, G. Dieterle, M.Weigand, M. Fahnle, G. Woltersdorf, C.H. Back and G. Schutz
Physical Review B 90, 104415 (2014)    

Spatial constraints on the source of uniaxial anisotropy in (Ga,Mn)As films
G. Woltersdorf, J. Stigloher, H.S. Korner, F. Hoffmann; M. Kiessling, V. Novak, J-Y. Chauleau, C.H. Back
Journal of Physics D 47, 195001 (2014)   

Spin Hall voltages from a.c. and d.c. spin currents
D. Wei,  M. Obstbaum,  M. Ribow,  C.H. Back, and G. Woltersdorf
Nature Communications 5, 3768 (2014)    

Coupling of spinwave modes in wire structures    
H.G. Bauer, J.-Y. Chauleau, G. Woltersdorf, and C.H. Back
Applied Physics Letters 104, 102404 (2014)    

Vortex Core Reversal Due to Spin Wave Interference
H.G. Bauer, M. Sproll, C.H. Back, and G. Woltersdorf
Physical Review Letters 112, 077201 (2014)    

Inverse spin Hall effect in Ni81Fe19/normal-metal bilayers
M. Obstbaum, M. Härtinger, H.G. Bauer, T. Meier, F. Swientek, C. H. Back, and G. Woltersdorf
Physical Review B 89, 060407(R) (2014)    

Self-consistent determination of the key spin-transfer torque parameters from spin-wave Doppler experiments
J.-Y. Chauleau, H.G. Bauer, H. S. Körner, J. Stigloher, M. Härtinger, G. Woltersdorf, and C.H. Back
Physical Review B 89, 020403(R) (2014)   

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