F. Formisano MSc (Fabio)

Promovendus - Ultrafast Spectroscopy of Correlated Materials

F. Formisano MSc (Fabio)

Heyendaalseweg 135
Interne postcode: 78


Postbus 9010

Werkdagen maandag, dinsdag, woensdag, donderdag, vrijdag

Optical control of magnetism, i.e. switching magnets between metastable states with
light, is an intriguing and rapidly growing fundamental research area the outcome of which may have a direct impact on the future development of the 50 billion euro/per year magnetic data storage industry. This project is inspired by the dream to achieve magnetic switching during which the entropy of the magnet does not have time to increase. In theory this condition fulfills the requirement for zero-heat production, opening intriguing opportunities for low-power magnetic switching. To achieve the fastest possible and least dissipative magnetization reversal, we suggest to employ the strongest interaction in magnetism – the exchange coupling between spins. The effective fields with which the exchange acts on spins reach 100-1000 T, being thus much larger than those generated by conventional electromagnets. Exploiting these huge fields can in principle lead to ultrafast changes in the magnetic order. The proposed research program aims: (a) to employ novel experimental methods for ultrafast (10-12 seconds and faster) manipulation and detection of the strength of the exchange interaction in condensed matter using light; (b) to reveal the non-dissipative mechanisms allowing an enhancement or aweakening of the exchange interaction at will as well as to achieve the most efficient and fastest way to control spins; (c) using the knowledge accumulated in the project to develop novel concepts for ultrafast processing of magnetically stored information without heating. To reach these goals we will employ high magnetic fields, the strength of which is comparable to that of the exchange interaction, and (far)-infrared electromagnetic radiation with photon energies at the scale of the exchange energy. We are going to build a set-up for the 2M mode spectroscopy by using of of Kaleidoscope hollow fiber compressor which is necessary for generation of sub-10 fs laser pulses.