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MA: Fachverband Magnetismus

MA 14: Magnetization Dynamics II

MA 14.8: Vortrag

Montag, 14. März 2011, 18:45–19:00, HSZ 403

Zero-field magnetization reversal of two-body Stoner particles with dipolar interaction — •Zhouzhou Sun, Alexander Lopez, and John Schliemann — Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany

In the framework of the Landau-Lifshitz-Gilbert equation, we investigate magnetization reversal in a system of two Stoner particles both subject to a static antiparallel magnetic field, and taking into account their mutual dipolar interaction. We identify an interesting regime of stable synchronized dynamics where the two particles are implementing a single information bit. Here a modified Stoner-Wohlfarth limit is obtained which shows a dramatically lower critical switching field (even including zero) and also a substantially shorter reversal time, by appropriately engineering the dipolar interaction strength between the two particles. Our analytical results are also verified by numerical simulations and thus offer new technological perspectives regarding devices for information storage and/or fast magnetic response.