Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Focus: All-optical magnetic switching

MA 41.4: Hauptvortrag

Donnerstag, 19. März 2015, 11:30–12:00, H 1012

All-optical helicity-dependent magnetic switching in Tb-Fe — •Rudolf Bratschitsch — Physikalisches Institut, Westfälische Wilhelms-Universität Münster

Ferrimagnets such as GdFeCo can be switched all-optically by circularly polarized femtosecond laser pulses, opening the door to ultrafast magnetic data storage. We reveal all-optical switching (AOS) in the ferrimagnet Tb-Fe [1]. We demonstrate that AOS also occurs in a tailored artificial zero moment magnet consisting of two TbFe layers, which exhibit no AOS as single layers [2]. Finally, we show that expensive and bulky laser amplifier systems are not necessary to induce AOS and present AOS with a laser oscillator [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)