Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.5: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

Emission properties of spintronic terahertz emitters — •Rieke von Seggern¹, Christopher Rathje¹, Nina Meyer², Christian Denker², Markus Münzenberg², and Sascha Schäfer¹ — ¹Institute of Physics, University of Oldenburg, Germany — ²Institute of Physics, University of Greifswald, Germany

In recent studies, the emission of strong single-cycle terahertz (THz) pulses from spintronic bilayer structures has been demonstrated, using the inverse Spin-Hall effect [1] of optically excited spin-polarized currents [2]. The emission shows a gapless spectrum with a bandwidth of up to 30 THz and high peak fields, offering promising avenues for THz spectroscopy.

In this work, we investigate the THz emission properties of Pt(2 nm)/Co₄Fe₄B₂(2.08 nm) driven by ultrashort optical pulses (1030-nm central wavelength, 255-fs pulse duration). We present our approach for controlling the emission properties by structured emitter surfaces and characterize the emitted THz pulses by electro-optic sampling. Nano- and microstructured spintronic THz emitters may enable a detailed tailoring of spatial and spectral emission poroperties and have the potential for large amplitude THz near-field excitation.

Saitoh et al., Appl. Phys. Lett. 88, 182509 (2006)
Seifert et al., Nat. Photonics 10, 483-488 (2016)