micromagnetic simulation

Investigating magnetic nano-chains

Chains of asymmetric nanodots were modelled, using micromagnetic simulations, to verify the possibility to introduce magnetic domain-walls. For this, a combination of an anisotropy, defining the direction in which the domain wall should move, with alternating magnetic fields of suitable frequency and amplitude was found to be necessary.

Controlling vortex circularity and polarity

Magnetic vortices are of high interest in basic and applied research, e.g. for possible applications in data storage, signal transfer, logic devices, etc. They can be described by the polarity of the central core (with the magnetization pointing "up" or "down") and their circularity (rotational direction of the magnetization around the central core). If it were possible to manipulate both properties independently, two bits could be realized by one such nano-dot with a vortex, similar to our approaches utilizing fourfold nanomagnets.

High symmetry gadolinium(III) polyhedra

In a recent article, creation of hollow nanospheres Gd20, Gd32, Gd50 and Gd60 is described using the approach to assemble fragments containing different polygons. While structural analysis revealed the symmetries of the respective nanospheres, magnetic studies show in theory and experiment that these polyhedra show antiferromagnetic interaction which can be attributed to classical spins at the Gd sites. Magnetic measurements can even be used as "fingerprints" to identify the polyhedra.

Magpar for beginners - a tutorial

Installation of parallel-computing Magpar micromagnetic simulator is a very challenging task for all interested physicists, and scientists in general, for whom computer science experience is from natural reasons very poor, especially within Unix-like systems. In the following report the reader can find step-by-step information how to install Magpar in Linux-based system. Since Magpar was issued in 2010, many details about location of files are not actual today.