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MA: Fachverband Magnetismus

MA 20: POSTER Ib

MA 20.8: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Sign change of MOKE-signals in engineered AOS materials — •Ute Bierbrauer¹, Sabine Alebrand¹, Michel Hehn², Charles-Henri Lambert², Daniel Steil¹, Oliver Schmitt¹, Eric Fullerton³, Stéphane Mangin², Mirko Cinchetti¹, Stefan Mathias¹, and Martin Aeschlimann¹ — ¹TU Kaiserslautern, Deutschland — ²IJL Nancy, Frankreich — ³CMR San Diego, USA

Since the discovery of a transient ferromagnetic-like state in amorphous rare-earth transition-metal alloy films [1] a connection between this ultrafast magnetization process and helicity-dependent all-optical switching (AOS) is assumed.

Here we demonstrate that a sign change of the magnetization within a fs demagnetization experiment [2] can also be observed in the recently discovered [3,4] more complex AOS systems, including ferrimagnetic and ferromagnetic multilayer structures. We show our recent results in this field with regard to the ultrafast magnetization dynamics of these materials, particularly with a closer view on the magnetization reversal occurring on the femtosecond timescale. The presented results link the appearance of a transient negative MOKE signal as a required property of AOS materials.

[1] Radu et al. Nat. 472 (7342), 205-8 (2011)

[2] Alebrand et al., PRB 89, 144404 (2014)

[3] Mangin et al.Nat. Mat. 13, 286-292 (2014)

[4] Lambert et al. Science 325 (6202), 1337-1340 (2014)