Ultrafast magnetism

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 [1]. We have shown that AOS also occurs in artificial zero moment magnets consisting of magnetic bilayers [2]. Previously, expensive and bulky laser amplifier systems were necessary to induce AOS. We have demonstrated AOS with a laser oscillator for the first time [3].

[1] A. Hassdenteufel et al., Adv. Mat. 25, 3122 (2013)

[2] C. Schubert et al., Appl. Phys. Lett. 104, 082406 (2014)

[3] A. Hassdenteufel et al., Opt. Expr. 22, 10017 (2014)