High-energy spin dynamics in multiferroic ErFeO3 for magnon transport application

ErFeO₃, a multiferroic material, displays rich magnetic behaviour due to the interaction between Fe³⁺ and Er³⁺ ions, making it a promising candidate for spintronics and magnonics applications. While the low-energy magnon dynamics of this system have been extensively studied, the high-energy regime remains unexplored. This proposal aims to investigate the high-energy spin dynamics of ErFeO₃ using inelastic neutron scattering studies employing Merlin spectrometer. We will measure the magnon dispersions up to 100 meV at temperatures below and above magnetic transitions: (i) Fe³⁺ spin reorientation at ~95 K and (ii) Er³⁺ ordering at 4.5 K. Understanding the Fe - Fe interactions, including Heisenberg exchange and Dzyaloshinskii-Moriya interactions, will offer insights into spin-wave propagation crucial for future magnon-based devices. Our study will contribute to the development of spintronics by providing data on magnon group velocities and magnon propagation lengths, both vital for efficient magnon transport.