Switching probabilities of magnetic vortex core reversal studied by table top magneto optic Kerr microscopy

Magnetic vortex core reversal by excitation of spin waves

Micron-sized magnetic platelets in the flux-closed vortex state are characterized by an in-plane curling magnetization and a nanometer-sized perpendicularly magnetized vortex core. Having the simplest non-trivial configuration, these objects are of general interest to micromagnetics and may offer new routes for spintronics applications. Essential progress in the understanding of nonlinear vorte...

Fast switching of magnetic fields in a magneto-optic trap

Magnetic pulse generation for high-speed magneto-optic switching

In this article, the magnetic pulse characteristics needed to achieve high-speed magneto-optic (MO) switching are investigated. A fiber-based, MO, low-voltage optical switch capable of 200 ns switching is presented, along with the special circuit characteristics for magnetic field generation for high-speed switching. The switch consists of the optical system, the MO material (bismuth substitute...

Magnetic properties of ultrathin Co / Ag / Ge ( 1 1 1 ) films studied using surface magneto - optic Kerr effect technique

Co/Ag/Ge (1 1 1) films show an in-plane anisotropy as deposited at 200K. The ferromagnetic inactive layers, formed due to the intermixing of Co and Ge, can be efficiently reduced to zero thickness by introducing 6 monolayer (ML) Ag as a buffer layer. For Co/3ML Ag/Ge (1 1 1) films, the amount of Ag is not enough to separate Co and the Ge substrate. This results in the formation of a 2-monolayer...

Mechanism of Fast Axially Symmetric Reversal of Magnetic Vortex Core

The magnetic vortex core in a nanodot can be switched by an alternating transversal magnetic field. We propose a simple collective coordinate model, which describes the comprehensive vortex core dynamics, including the resonant behavior, weakly nonlinear regimes, and reversal dynamics. A chaotic dynamics of the vortex polarity is predicted. All analytical results are confirmed by micromagnetic ...