Dynamics of Vortex Nucleation in Nanomagnets with Broken Symmetry

Abstract

We investigate fundamental processes that govern dynamics of vortex nucleation in sub-100 nm mesoscopic magnets. We focus on a structure with broken symmetry - Pacman-like nanomagnet shape - in which we study micromagnetic behavior both by means of a simple model and numerically. We show that it is possible to establish desired vortex chirality and polarity by applying only quasi-static in-plane magnetic field along specific directions. We identify the modes of vortex nucleation that are very robust against external magnetic field noise. These vortex nucleation modes are common among wide range of sub-100 nm magnets with broken rotational symmetry.

5 pages, 4 figures

References in corpus (3)

• Soliton pair dynamics in patterned ferromagnetic ellipses
• Time-Resolved X-ray Microscopy of Spin-Torque-Induced Magnetic Vortex Gyration
• Ultrafast Vortex-Core Reversal Dynamics in Ferromagnetic Nanodots

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• Fast and deterministic switching of vortex core induced by out-of-plane current in notch disks
• Non-destructive Ultrafast Steering of Magnetic Vortex by Terahertz Pulses