Third Funding Period 2024-2027:

B11  Spin+THz-dynamics: Understanding and utilizing photon-to-magnon conversion processes

JProf. Dr. Philipp Pirro (Department of Physics, RPTU)
Prof. Dr. Martin Aeschlimann (Department of Physics, RPTU)
Prof. Dr. Georg von Freymann (Department of Physics, RPTU)

Project B11 combines ultrafast demagnetisation processes and magnonics, two important areas of spin dynamics that have essentially been treated separately until now. By extending the combined setup to study ultrafast demagnetization and subsequent remagnetization by time-resolved magneto-optical Kerr effect measurements and simultaneous study of the magnon spectrum by Brillouin light scattering spectroscopy and THz excitation and detection methods, the mechanisms driving the relaxation from ultrafast demagnetization to remagnetization and possible control of these processes by resonant/non-resonant electromagnetic fields will be determined.

Second Funding Period 2020-2023:

B11  Spin+THz-dynamics: Understanding and utilizing photon-to-magnon conversion processes

JProf. Dr. Philipp Pirro (Department of Physics, RPTU)
Prof. Dr. Martin Aeschlimann (Department of Physics, RPTU)
Prof. Dr. Georg von Freymann (Department of Physics, RPTU)

Project B11 aims to establish the link between the field of ultrafast demagnetization processes and the field of magnonics. A combined setup to probe the ultrafast demagnetization and the following remagnetization by time resolved magneto-optical Kerr effect measurements simultaneously with the magnon spectrum probed by Brillouin light scattering spectroscopy and THz excitation and detection methods will be established. This will allow to investigate the optically induced single-particle spin excitations on femtosecond time scales in a strong non-equilibrium state and the subsequent conversion processes to magnonic excitations, dominating on longer timescales and during the remagnetization.