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Calculating H Fields from Magnetization: mag2hfield

The mag2hfield utility takes a MIF 1.1 micromagnetic problem specification file (.mif) and a magnetization file (.omf) and uses the mmSolve2D computation engine to calculate the resulting component (self-magnetostatic, exchange, crystalline anisotropy, Zeeman) and total energy and/or H fields. The main use of this utility to study the fields in a simulation using magnetization files generated by an earlier mmSolve2D run.

The mag2hfield launch command is:

tclsh oommf.tcl mag2hfield [standard options]
   [-component [all,][anisotropy,][demag,][exchange,][total,][zeeman] \
   [-data [energy,][field]] [-energyfmt fmt] [-fieldstep #] \
   mif_file omf_file [omf_file2 ...]
-component [all,][anisotropy,][demag,][exchange,][total,][zeeman]
Specify all energy/field components that are desired. Optional; default is total, which is the sum of the crystalline anisotropy, demagnetization (self-magnetostatic), exchange, and Zeeman (applied field) terms.
-data [energy,][field]
Calculate energies, H fields, or both. Energy values are printed to stdout, H fields are written to files as described below. Optional; the default is energy,field.
-energyfmt fmt
Output C printf-style format string for energy data. Optional. The default format string is "%s".
-fieldstep #
Applied field step index, following the schedule specified in the input MIF file (0 denotes the initial field). Optional; default is 0.
MIF micromagnetic problem specification file (.mif). Required.
Magnetization state file. This can be in any of the formats accepted by the avfFile record of the input MIF file. Required.
omf_file2 ...
Optional additional magnetization state files.

The H field output file format is determined by the Total Field Output Format record of the input MIF 1.1 file. The output file names are constructed using the form basename-hanisotropy.ohf, basename-hzeeman.ohf, etc., where basename is the input .omf magnetization file name, stripped of any trailing .omf or .ovf extension.

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OOMMF Documentation Team
September 30, 2022