Speaker
Description
Magnons, the elementary excitations of magnetic order, offer a promising route towards ultrafast information processing without charge transport. However, generating sub-picosecond magnon pulses that propagate over technologically relevant distances without losing coherence or broadening has remained a major challenge. Achieving this combination requires broadband excitation, coherent phase control, weak dispersion and predominantly ballistic transport.
In this talk, we demonstrate the generation and propagation of coherent, ultrashort magnon pulses in the altermagnetic insulator α-Fe₂O₃ (hematite) using terahertz spin-orbit torques in an adjacent platinum layer. By employing phase-resolved terahertz transmission spectroscopy, we investigate the dynamics and transport properties of these pulses, showing their coherent, ballistic and non-dispersive propagation. The talk will present the experimental approach and the key characteristics of the observed magnon dynamics, highlighting the potential of this method for ultrafast magnonic information processing and for exploring high-frequency spin dynamics in altermagnets and other magnetic materials.
| Type of presence | Presence online |
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