All-optical single pulse magnetization switching of ferromagnetic [Co/Pt] observed forGdFeCo / Cu / [Co/Pt] spin valve structure

摘要

In 2007, all-optical magnetization switching (AOS) using femtosecond (fs) laser pulse in GdFeCo ferrimagnet was demonstrated [1]. Subsequently, AOS in GdFeCo ferrimagnet was found to be helicity-independent and induced only by single fs-laser pulse [2]. Single pulse switching of GdFeCo is attributed to the antiferromagnetic coupling between Gd and Fe moment and non-equilibrium transient ferromagnetic states [2]. Recently, AOS in not only ferrimagnetic GdFeCo but also ferromagnetic [Co/Pt] multilayer was demonstrated [3]. The AOS m ferromagnetic [Co/Pt] is achieved by multiple pulses and helicity dependent [4]. In tms study, we demonstrated that ferromagnetic [Co/Pt] is switched by single fs-laser pulse in GdFeCo / Cu / [Co/Pt] spin valve structure.