Fig. 5. A paradigm of the optical quenching–assisted, magnetic vortex–based information recording process.

(Left) Schematic of the optical quenching–assisted, magnetic vortex–based information recording system, where a linear polarized femtosecond laser pulse is used to transiently demagnetize the initial magnetic vortex and another synchronized orthogonal small magnetic field pulse is used to set the polarization of the newly formed magnetic vortex. (Right) Sketch for the working mechanism of the optical quenching–assisted, magnetic vortex–based information recording process. The data information “1” and “0” are recorded by the polarity (up and down) of the magnetic vortex. The fluence of the femtosecond laser pulse should be controlled above the threshold for spin melting, but below the threshold for changes in the ferromagnetic disk’s crystallites.