Regensburg 2010 – scientific programme
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MA: Fachverband Magnetismus
MA 22: Spin Dynamics / Spin Torque III
MA 22.11: Talk
Thursday, March 25, 2010, 12:15–12:30, H10
Multi-macro spin simulations of opto-magnetic switching — •Stefan Gerlach1, Denise Hinzke1, Thomas Ostler2, Roy W. Chantrell2, and Ulrich Nowak1 — 1University of Konstanz, 78457 Konstanz, Germany — 2University of York, York YO10 5DD, U. K.
The ultrafast manipulation of the magnetization with the aid of femtosecond laser pulses promises to become a real alternative to writing techniques where magnetic field pulses are used in addition to laser heating. It was recently demonstrated [1] that a 40 fs, circularly polarized laser pulse is able to reverse the magnetization on a picosecond time scale as if the laser pulse acts as an equally short magnetic field pulse with a polarization dependent direction caused by the so-called inverse Faraday effect.
To investigate the opto-magnetic magnetization reversal, we use Landau-Lifshitz-Bloch (LLB)-based multi-macro spin simulations [2] for extended systems with up to 4 × 106 macro-spins (10 µ m × 10 µ m) where the exchange coupling as well as the dipolar interaction is taken into account. Furthermore, we assume a Gaussian temperature profile in order to model a realistic laser spot and to explore the size of a stable opto-magnetically reversed area after excitation. We will show and discuss results of the magnetization evolution of thin films and compare with recent experiments [3].
[1] C. D. Stanciu et al., Phys. Rev. Lett. 99, 047601 (2007) [2] N. Kazantseva et al., Phys. Rev. B 77, 184428 (2008) [3] K. Vahaplar et al., Phys. Rev. Lett. 103, 117201 (2009)