Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Terahertz dynamics

MA 49.1: Vortrag

Donnerstag, 15. März 2018, 15:00–15:15, EB 202

Exploring magneto-optical interactions in rare-earth doped garnets by multi-dimensional THz spectroscopy — •Shovon Pal¹, Christian Tzschaschel¹, Takuya Satoh², and Manfred Fiebig¹ — ¹ETH Zurich, Switzerland. — ²Kyushu University, Japan.

Multi-dimensional nonlinear spectroscopy is a very powerful tool that bears the potential to unravel the dynamics (both coherent and incoherent) and coupling of elementary interactions in solid-state systems. Due to low THz photon energies, these radiations provide a means to address electronic states by resonant excitation and detection of electronic states having energy differences in the meV range. Typically, intense THz pulses have the potential to induce ultrafast electric- or magnetic-switching operations that last from a few tens of femtoseconds to a few tens of picoseconds. For example, observation of multiple harmonics and quantum coherences in semiconductor systems and canted antiferromagnets. Further, both energy and time scales of THz radiation favors fundamental investigations on magneto-optical interplay at the quantum level. Garnets, in particular, provide a platform towards the development of technologically relevant material for magneto-optical spintronic devices. On doping with rare-earth elements, they show an unusual strong excitation of magnetization precession with a frequency in the THz regime, resulting from the exchange interaction between rare-earth and transition metal elements. We present our direct observation of this nonlinear magneto-optical interaction at 0.5 THz in a Gd, Yb-doped bismuth iron garnet via two-dimensional THz time domain spectroscopy.