Spin Dynamics and Manipulation of THz Generation
- PC Department Seminar
- Date: Jul 14, 2025
- Time: 11:00 AM (Local Time Germany)
- Speaker: Elias Kueny
- Location: Building G
- Room: 2.06
- Host: Alexander Paarmann
- Topic: Discussion and debate formats, lectures
THz spintronics is an emerging field of research that combines ultrafast optics with spintronics, leveraging the speed of lasers to study magnetic dynamics. The use of THz radiation presents an energy-efficient alternative to optical pulses as it directly targets the excitation of magnons. Conversely, magnetic processes on a picosecond timescale result in the emission of THz radiation. This work explores the topic of THz spintronics from both directions.
We use a high-energy THz source with the goal of resonantly exciting the spin dynamics of antiferromagnets. We observe the ferromagnetic and antiferromagnetic uniform magnon modes in the model canted antiferromagnet FeBO3. In a second part, we explore spintronic THz emitter designs to find novel approaches for manipulating spin currents. Using spin valve-like samples, this work demonstrates their ability to dynamically enhance or suppress the THz emission with the application of a magnetic field, as well as switch the orientation of the THz polarization.