micromagnetic-simulations

Scripts to process OOMMF vector files (.ovf) Configuration files for OOMMF and mumax

Utilities for stray field analysis

plot_quiver.py

Methods

1. plot_2D_quiver
   • Takes two arguments: (file_path: str, mag_dir: str)
   • Takes an ovf file (OOMMF format) and parses the xnodes, ynodes, znodes as well as the x, y and z step sizes. These are required to construct the mesh
   • mag_dir takes in a string of either 'x', 'y', 'z' or 'total', and specifies what to display for the magnitude of the contour line
   • The function assumes a zslice in the centre
   • The units of the data corresponds to the setting in the OOMMF file

plot_strayfield.py

Methods

1. plot_strayfield
   • Take four arguments: (file_path: str, mag_dir: str, yslice: [int], dotted=False)
   • Takes an ovf file (OOMMF format) and parses the xnodes, ynodes, znodes as well as the x, y and z step sizes.
   • mag_dir takes in a string of either 'x', 'y', 'z' or 'total'
   • yslice specifies the distance to plot stray field at
   • dotted is a graph display parameter

Simulated Annealing

Simulated annealing was implemented in the optimisation folder. This optimises for maximum stray field at the centre of a square array of magnets.

Installation of OOMMF

Linux

# Download essentials
$ sudo apt-get install build-essential

# Download OOMMF binary from website
$ wget https://math.nist.gov/oommf/dist/oommf20a2_20190930.tar.gz
$ gunzip -c oommf20a2_20190930.tar.gz | tar xvf -

# Download tcl
$ sudo apt-get install tcl
# Download extra tcl/tk components
$ sudo apt-get install tcl8.6-dev
$ sudo apt-get install tk8.6-dev

# Check if installation went okay
$ cd ./oommf && tclsh oommf.tcl +platform

# Build oommf
$ tclsh oommf.tcl pimake upgrade
$ tclsh oommf.tcl pimake distclean
$ tclsh oommf.tcl pimake

Running mif files using CLI

$ tclsh oommf.tcl boxsi