Emissione di onde di spin unidirezionali utilizzando l'effetto Cherenkov

Spin waves have emerged as a promising avenue for information processing and transmission at the nanoscale in the field of spintronics. The spin Cherenkov effects is the equivalent for spin wave of electromagnetic waves Cherenkov radiation, it occurs when a magnetization deformation propagate through a medium at a velocity greater than the phase velocity of spin wave in the medium. This effect has garnered significant attention due to its potential for various applications. In this master’s thesis, we investigate possibility to use the spin Cherenkov effect in the context of unidirectional antenna design. The primary objective of this research is to explore the generation of unidirectional spin waves by utilizing the interference between two spin Cherenkov sources. Unidi- rectional spin wave emitters offer enhanced energy efficiency and directivity, making them appealing for future spintronic devices. The investigation utilizes micromagnetic simulations performed with the software MuMax3, enabling detailed exploration of spin wave dynamics and interactions in different materials and geometries. In addition to the simulation-based study, we propose a potential experimental approach involving moving Abrikosov vortices as magnetic moving excitations. By engineering the dynamics of these vortices, it is possible to create a moving spin wave source exhibiting unidirectional emission characteristics. Experimental validation of this concept will provide crucial evidence for the practical implementation of unidirectional spin wave emitters. The thesis begins with a comprehensive overview of the Cherenkov effect for spin waves, reviewing the existing literature and identifying research gaps. This establishes the context and sets the stage for further investigation. Through micromagnetic simulations and a potential experimental approach, this research aims to contribute to the understanding of the fundamental principles underlying the generation of unidirectional spin waves. The outcomes of this thesis will advance our knowledge of spin wave physics, par- ticularly in relation to the Cherenkov effect and unidirectional spin wave emission. The development of unidirectional ultrashort spin wave emitters holds great promise for spintronic applications such as data transmission and signal processing. By harnessing the unique properties of unidirectional spin waves, efficient and compact spin wave antennas can be designed and integrated into future magnonic and spintronic devices.