Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Magnetization / Demagnetization Dynamics III
MA 34.4: Vortrag
Mittwoch, 28. März 2012, 15:45–16:00, H 1012
Ultrafast switching of ferrimagnets — Sönke Wienholdt1, Denise Hinzke1, Peter Openeer2, and •Ulrich Nowak1 — 1Universität Konstanz, 78457 Konstanz, Germany — 2Uppsala University, 75120 Uppsala, Sweden
The ultrafast manipulation of magnetisation by fs laser pulses promises to become a real alternative to conventional techniques based on magnetic fields. It was demonstrated that a 80 fs, circularly polarised laser pulse is able to reverse magnetisation on a ps time scale, as if it acts as a short magnetic field pulse caused by the inverse Faraday effect [1]. In single-shot time-resolved imaging of magnetic structures [2] it has been shown that the magnetisation reverses via a linear pathway [3] without any precession. Even with linearly polarized light switching was demonstrated recently [4], probably on a purely thermal basis. These new types of switching have been demonstrated only in ferrimagnetic materials like GdFeCo, probably because of the antiferromagnetic coupling of the two different sub-lattices in these materials, leading to completely different dynamics as compared to a ferromagnet. To understand this new type of dynamics we perform atomistic spin model simulations of ferrimagnets and investigate their switching mechanisms in detail.
[1] C. D. Stanciu et al., Phys. Rev. Lett. 99, 047601 (2007). [2] K. Vahaplar et al., Phys. Rev. Lett. 103, 117201 (2009) [3] N. Kazantseva et al., Europhys. Lett. 86, 27006 (2009) [4] I. Radu et al., Nature 472, 205 (2011)
Funded by the EU project FemtoSpin and the CAP in Konstanz.