Nmag console commands in a nutshell

Nmag is a python-based micromagnetic simulator for finite elements mesh. First we add the path and one alias for a comfort work to our bashrc from <nsim>/bin directory: echo "export PATH=\$PATH:`pwd`" >> ~/.bashrc echo "alias nmeshimportg='`pwd`/nmesimport –gmsh'" >> ~/.bashrc Convert the mesh in Version ASCII v2.x format to Version 1:…

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Some tips for MPI and cluster usage

Note, that all information below may not be suitable for every computing cluster due to many differences in operation systems and local settings for user management and parallelization software. Available modules. Command $ module avail gives the list of available modules, such as mpi/openmpi/1.3.2/intel for example. Command «module load <modulename>», where <modulename>…

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Fun with very large numbers from R. Baillie

I have found a link to an interesting paper in a one social network. Robert Baille shows a few tricks with «almost» true functions: they can be true in the huge interval of their arguments, but fail for the other their values. And numerical methods will fail for direct check. Link…

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pybibparse v0.11

First version of python-based bibtex parser pybibparse v0.11 is released! Improved work with entries: they are accessible via index in internal list of entries. Use and enjoy 🙂

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Bloch Point Structure in a Magnetic Nanosphere

We classify possible types of Bloch points and analytically derive the shape of the magnetization distribution for different Bloch points. Phys. Rev. B 85, 224401 (2012), 10.1103/PhysRevB.85.224401, PDF. Supplementary materials.

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Out-of-surface vortices in spherical shells

We show that the curvature of the underlying surface leads to a coupling between the localized out-of-surface component of the vortex with its delocalized in-surface structure, i.e., polarity-chirality coupling. Phys. Rev. B 85, 144433 (2012), 10.1103/PhysRevB.85.144433, PDF.

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Source code

Source code of slasi module for simulations consists of the next files: alltypes.h: definition of structures and global variables used in all another files. clargs.c/clargs.h: processing of command-line arguments. constants.h: some constants. fields.c/fields.h: functions for magnetic field processing: initialization (reducing field parameters) and calculation of field for given time and…

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Bloch Point Structure in a Magnetic Nanosphere

Authors: Oleksandr V. Pylypovskyi, Denis D. Sheka, Yuri Gaididei Publication: Phys. Rev. B 85, 224401 (2012), 10.1103/PhysRevB.85.224401 Comments: 8 pages, 7 figures arXiv: http://arxiv.org/abs/1112.2413 The micromagnetic singularity, the so–called Bloch point, can form a metastable state in the nanosphere. We classify possible types of Bloch points and derive analytically the…

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