Ferrimagnets such as GdFeCo can be switched by circularly polarized femtosecond laser pulses, opening the door to ultrafast magnetic data storage. We investigated this so-called all-optical switching (AOS) in Tb-Fe . We have shown that AOS also occurs in artificial zero moment magnets consisting of magnetic bilayers . Previously, expensive and bulky laser amplifier systems were necessary to induce AOS. We have demonstrated AOS with a laser oscillator for the first time .
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