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MA: Fachverband Magnetismus

MA 22: Magnetization Dynamics I

MA 22.5: Vortrag

Mittwoch, 2. April 2014, 10:30–10:45, HSZ 401

Switching dynamics of two-sublattice magnets — •Sönke Wienholdt¹, Denise Hinzke¹, Karel Carva^2,3, Peter Oppeneer², and Uli Nowak¹ — ¹University of Konstanz, Germany — ²Uppsala University, Sweden — ³Charles University in Prague, Czech Republic

It has been demonstrated recently that linearly polarized light can trigger a thermally driven switching in ferrimagnetic GdFeCo compounds [1,2] via a so called ''ferromagnetic-like state'', where the rare-earth (RE) and transition metal sublattice magnetizations are aligned parallel on a ps time scale. The ultra-short time scale of the laser pulse and the high electron temperatures following the excitation lead to non-equilibrium processes where longitudinal magnetization dynamics becomes pronounced [2-4]. Recently, we have shown [5] that the thermally driven spin-switching of RE-based ferrimagnets can be well described on the basis of an orbital-resolved spin model, distinguishing electrons in d and f orbitals. In this talk we will show with atomistic spin model simulations that even after having reached the transient ferromagnetic-like state, the system does not necessarily switch. Recently this has also been observed experimentally with element specific measurements on TbFeCo [6]. We acknowledge funding by the European Comission via the Collaborative Project FEMTOSPIN.

[1] I. Radu et al., Nature 472, 205 (2011). [2] T. A. Ostler et al., Nat. Commun. 3, 666 (2012). [3] N. Kazantseva et al., Europhys. Lett. 81, 27004 (2008). [4] J. H. Mentink et al., Phys. Rev. Lett. 108, 057202 (2012). [5] S. Wienholdt et al., Phys. Rev. B 88, 020406(R) (2013). [6] A. R. Khorsand et al., Phys. Rev. Lett. 110, 107205 (2013).