Regensburg 2007 – scientific programme

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MA: Fachverband Magnetismus

MA 24: Spindynamics / Switching II

MA 24.8: Talk

Thursday, March 29, 2007, 12:00–12:15, H23

Temperature dependent magnetization switching — •Alexander Sukhov and Jamal Berakdar — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle/Saale, Germany

Recenlty, it has been shown [1] that the switching behaviour of magnetic nanoparticles can be well controlled by means of time-dependent magnetic fields. Motivated by these findings, we study in this theoretical work the spin-dynamics and the switching properties of a magnetic nanoparticles (Stoner-particles) using the Landau-Lifshitz-Gilbert equation extended for the case of finite temperatures, a task which has not been tacked by previous studies [2]. In particular, we are interested in the minimal amplitudes of the switching fields and the corresponding reversal times of the magnetic moment of the nanoparticle both for static and time-dependent external fields depending on the damping. Optimal parameters for the magnetization reversal and their temperature dependence are worked out.

References:

[1] C. Thirion, W. Wernsdorfer and D. Mailly, Nat. Mater. 2, 524 (2003).

[2] Z. Z. Sun and X. R. Wang, Phys. Rev. Lett. 97, 077205 (2006).