Akiyoshi Itoh

TL;DR: It is experimentally demonstrate that the magnetization can be reversed in a reproducible manner by a single 40 femtosecond circularly polarized laser pulse, without any applied magnetic field, revealing an ultrafast and efficient pathway for writing magnetic bits at record-breaking speeds.

TL;DR: It is found that the ultrafast spin reversal in GdFeCo, where spins are coupled antiferromagnetically, occurs by way of a transient ferromagnetic-like state, which provides a concept for the possibility of manipulating magnetic order on the timescale of the exchange interaction.

TL;DR: Numerically and experimentally a novel mechanism of deterministic magnetization reversal in a ferrimagnet driven by an ultrafast heating of the medium resulting from the absorption of a sub-picosecond laser pulse without the presence of a magnetic field is shown.

TL;DR: Using time-resolved single-shot pump-probe microscopy the mechanism and the time scale of all-optical magnetization reversal by a single circularly polarized 100 fs laser pulse are unveiled and it is demonstrated that for a 5 microm domain the magnetic information can be recorded and readout within 30 ps, which is the fastest "write-read" event demonstrated for magnetic recording so far.

TL;DR: The creation and real-space observation of magnetic structures with well-defined topological properties and a lateral size as low as about 150 nm are reported, generated in a thin ferrimagnetic film by ultrashort single optical laser pulses.