Abstract
Ultrafast magnetization manipulation by ultrafast lasers is an indispensable tool for both basic and applied research, with many surprises since the field was started twenty years ago [1]. The dynamics of the response depends on the energy transfer from the laser excited electrons to the spins within the first femtoseconds. This determines the speed of the ultrafast magnetization. A special material of interest for magnetic storage are FePt nanoparticles (Fig. 1 (a)). In a seminal experiment, all optical writing via the laser pulse helicity using a femtosecond laser pulse was demonstrated for FePt in a magnetic hard disc media by Lambert et al. in Science 2014 [2]. Completely surprisingly, the mechanism remained unclear and it opened many questions about the extension of possibilities of all optical writing as a general mechanism. I will review these recent developments that may lead to address an individual nanosized magnetic element in the far future all optically, for writing magnetic memory and memory storage [3].
© 2017 IEEE
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