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

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
Phys. Rev. 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]
Phys. Rev. Lett. 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
Phys. Rev. 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
J. Phys. 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
Appl. Phys. Lett. 104, 102404 (2014)    

Vortex Core Reversal Due to Spin Wave Interference
H.G. Bauer, M. Sproll, C.H. Back, and G. Woltersdorf
Phys. Rev. Lett. 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
Phys. Rev. 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
Phys. Rev. B 89, 020403(R) (2014)   

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