Theoretical Condensed Matter Physics

SPIN WAVES IN FERROMAGNETIC SYSTEMS (Magnonic Crystals, Artificial Spin Ice, Film, Hybrid Structures)

Spin waves are collective oscillations of the electron spins around the direction of a magnetic field (internal of the material).

PECULIARITIES OF SPIN WAVES («Magnons» → «Magnonics» is their Science)

1. «Quasi-particles», collective excitations emerging from complexity
2. No charge motion → no Joule effect nor ohmic losses (dissipationless information carriers)
   (topic: energy efficiency)
3. Moderate propagation speed (~km/s) → at GHz frequency (IT interest) they get nanometric wavelength
   → ideal information carriers in nanotechnology
4. By exploiting interference among different signals, they can attain logic operations («spin wave-logic devices»)

more recently: They can implement entanglement, possibly useful for quantum computing and quantum sensing.

FERROMAGNETIC SYSTEMS, THE SUBJECT OF THE INVESTIGATION

Federico Montoncello, homepage: https://docente.unife.it/federico.montoncello
email: montoncello@fe.infn.it