Current Funded Projects Junior Research Group Magnonic Hybrids
CHIRON targets a proof of principle of the essential elements for spin wave computing by an interdisciplinary approach joining partners with expertise in material science, physics, nano-manufacturing, electrical engineering, device simulation, and circuit design. CHIRON will fabricate basic logic gates, such as inverters and majority gates, demonstrate their operation, and assess their performance. As transducers between the CMOS and spin wave domains in hybrid circuits, CHIRON will develop magnetoelectric and multiferroic nanoresonators, based on nanoscale bulk acoustic resonators, which bear promise for high energy efficiency and large output signal. The targeted lateral scale (100 nm) and resonance frequency (>10 GHz) bring such resonators to the frontier of nano-electromechanical systems (NEMS).
In CHIRON, we use our expertise in Brillouin light scattering to investigate the excitation, propagation and interaction of magnons and phonons in close collaboration with our consortium partners. From our experiments, we draw conclusions about the main interaction mechanisms and the efficiency of the developed elements.
The main aim of this project is to address several key issues of skyrmion excitations using a combined approach of simulations and BLS experiments. We use BLS to access skyrmion excitations with finite wave vector and study linear and nonlinear skyrmion excitations in the presence of external stimuli. In addition, we investigate important material properties like symmetric and anti-symmetric exchange in thin films systems which are highly relevant for the formation, stability and dynamics of skyrmions.
Projects in the SFB/TRR 173 "Spin+X" of the DFG
B01 SPIN+MAGNON: SPIN EXCITATIONS FOR INFORMATION PROCESSING
This project makes use of the collective excitations of the spin system, the spin waves, to create new functionalities in the form of magnon circuits. In the focus are novel concepts which go beyond conventional and linear logic. To achieve this, nonlinear magnonic devices as well as devices with memory functionality will be realized. In addition, the concept of “quantum-classical analogies” will be introduced into magnonics. It exploits the similarities between the equations describing processes in quantum systems and coherent spin wave systems in the classical limit. This will allow to use concepts developed in atom physics and photonics to improve magnonic devices.
Project B11 aims to establish the link between the field of ultrafast demagnetization processes and the field of magnonics. We 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.