The project will enable the design, realisation and understanding of a highly coupled oxide based phonon-magnon system. This is motivated by that all these excitations are in the thermal region.
Accordingly being able to understand and control these excitations will allow for controlling thermal excitations that may be used for all-thermal signal processing. The project will push the knowledge of phonon-magnon interactions in the chosen model systems (LFO and LSMO) so that we can tailor films to optimise the coupling between the two modes. The aim is to understand the coupling, be able to switch the system with magnetisation direction and to be able to pump magnon Bose-Einstein condensates through phonons.
• We will be the first to understand and comprehensively map out phonon-magnon interactions in a oxide system through dynamic X-PEEM, THz and ultrafast optical spectroscopy and point contact based excitation. We will do this through tuning material properties through layer by layer growth of ferromagnetic LSMO films and antiferromagnetic LFO films and nano structuring of those. The systematic approach will open up new understanding on the tunability and underlying physics of these systems.
• We will turn the coupling through growing dedicated films and structuring at the micro-nano scale to match the phonon-magnon coupling and to achieve coupling dependent on the static magnetic orientation of the active elements.
• We will utilise up-conversion on the substrate, and high efficient point contacts pump a magnon Bose-Einstein condensate through phonons. This ability will signify a paradigm shift in the usability of such condensates, in particular for developing magnonic applications and components.
• We will develop STM-based point contact spectroscopy and improve optical probing in the THz region. This are novel new generic method for probing in THz-regime and will impact the development and our understanding of the complexity of low energy bosonic systems.
