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Your search keyword '"Tobias Kampfrath"' showing total 2 results
Start Over Author "Tobias Kampfrath" Journal 2019 44th international conference on infrared, millimeter, and terahertz waves (irmmw-thz)
2 results on '"Tobias Kampfrath"'

1. Study of Ultrafast Magnetism by THz Emission Spectroscopy

Author

Pablo Maldonado, Jacek Arabski, Peter M. Oppeneer, Keno L. Krewer, Guy Schmerber, Mischa Bonn, Eric Beaurepaire, Dmitry Turchinovich, Zuanming Jin, Tobias Kampfrath, and Wentao Zhang

Subjects
Magnetization dynamics, Materials science, Terahertz radiation, business.industry, Magnetometer, Magnetism, Physics::Optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, Magnetization, law, 0103 physical sciences, Femtosecond, Optoelectronics, Emission spectrum, 010306 general physics, 0210 nano-technology, business, Ultrashort pulse
Abstract

THz emission spectroscopy is a powerful tool to access ultrafast magnetization dynamics in laser-excited magnetic systems. Here, we demonstrate femtosecond terahertz magnetometry, a method that can be used to rigorously reconstruct the (sub)picosecond-timescale magnetization dynamics in photoexcited magnetic sample from the detected THz emission. Considering the propagation of the THz field from the surface of the sample to the THz electro-optic sampling unit, we establish the transfer function, which allows us to obtain the ultrafast magnetization dynamics in the laser-excited sample in a calibrated manner.

Published
2019

2. Effect of DC Electric Field on the Emitted THz Signal of Antenna-Coupled Spintronic Emitters

Author

M. R. S Rouzegar, Oliver Gueckstock, M. S. Abdelaziz, Tom Seifert, Samridh Jaiswal, Sascha Preu, Gerhard Jakob, M. Kläui, Tobias Kampfrath, and U. Nandi

Subjects
Materials science, Spintronics, business.industry, Terahertz radiation, Biasing, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Magnetic field, Magnetization, Electric field, 0103 physical sciences, Optoelectronics, Antenna (radio), 010306 general physics, 0210 nano-technology, Joule heating, business
Abstract

We study the impact of an external electric DC field on antenna-coupled spintronic THz emitters driven by a 90 fs, 1550 nm laser oscillator. Simultaneous application of external electric and magnetic field shows a quadratic decrease in peak-peak THz pulse with increase in the bias voltage. We ascribe this decrease to Joule heating caused by the DC current flowing through the spintronic material.

Published
2019

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