Title :
Nonlinear terahertz spectroscopy of magnetically ordered solids
Author :
Kampfrath, Tobias ; Sell, Alexander ; Eilers, Gerrit ; Wolf, Martin ; Fiebig, Manfred ; Leitenstorfer, Alfred ; Münzenberg, Markus ; Huber, Rupert
Author_Institution :
Univ. of Konstanz, Konstanz, Germany
Abstract :
We report on two investigations demonstrating that terahertz spectroscopy is a powerful tool to study the orbital and spin dynamics of electrons in magnetically ordered solids. First, we show that the terahertz pulse emitted from a photo-excited ferromagnetic Fe film is highly sensitive to the motion of spin-polarized electrons along the film interfaces. Second, the magnetic field of an intense terahertz pulse is used to induce a transient magnetization in the antiferromagnet NiO via Zeeman coupling to the NiO spins. A long-lived spin precession at the magnon frequency of 1 THz results.
Keywords :
Zeeman effect; antiferromagnetic materials; ferromagnetic materials; iron; magnetic thin films; magnetisation; magnons; metallic thin films; nickel compounds; spin dynamics; spin polarised transport; terahertz wave spectra; Fe; NiO; Zeeman coupling; antiferromagnet; frequency 1 THz; intense terahertz pulse; magnetically ordered solids; magnon frequency; nonlinear terahertz spectroscopy; orbital dynamics; photoexcited ferromagnetic film; spin dynamics; spin-polarized electrons; transient magnetization; Antiferromagnetic materials; Couplings; Electron emission; Frequency; Iron; Magnetic fields; Magnetic films; Magnetization; Solids; Spectroscopy;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves, 2009. IRMMW-THz 2009. 34th International Conference on
Conference_Location :
Busan
Print_ISBN :
978-1-4244-5416-7
Electronic_ISBN :
978-1-4244-5417-4
DOI :
10.1109/ICIMW.2009.5325693
