Fredrik Hansteen

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: In this paper, the temperature dependence of the ultrafast magnetic response in a ferrimagnetic amorphous thin film was investigated using an all-optical pump and probe technique, and it was shown that when the temperature of the sample approached the angular momentum compensation point, both frequency and the Gilbert damping parameter of the magnetization precession increase significantly.

TL;DR: The feasibility of subpicosecond magnetization reversal previously believed impossible is demonstrated by ultrafast heating of a ferrimagnet across its compensation points, under an applied magnetic field.

TL;DR: It is demonstrated that intense laser pulses can be used to directly control the spins in ferrimagnetic garnet films, thus demonstrating the feasibility of photomagnetic switching on the femtosecond time scale.

TL;DR: In this article, coherent optical control of the magnetization in ferrimagnetic garnet films on the femtosecond time scale through a combination of two different ultrafast and nonthermal photomagnetic effects and by employing multiple pump pulses was demonstrated.