Magnopy exporter

From the website repository root, install once:

python -m pip install ./exporters/magnopy

Export from your existing Magnopy Hamiltonian, LSWT object, and sampled path:

from magnopy_magnon_export import export_magnons
export_magnons("magnons.json", spinham, lswt, qpoints, relative=True)

Load the file in the magnon viewer. qpoints is N × 3. Use relative=True for magnetic-cell reciprocal lattice units; the default, like Magnopy, is Cartesian reciprocal coordinates.

To reuse already calculated modes without diagonalizing again:

# modes contains the native (omega, delta, G) result for each q, in meV.
export_magnons("magnons.json", spinham, lswt, qpoints, relative=True, modes=modes)

Without modes=, the exporter calls Magnopy’s own diagonalize method. Pass the matching, unchanged spinham for atomic positions. Cell lengths are assumed to be Å; use length_to_angstrom=10 for nm. Optional keywords include name, repetitions, atom_types, and highsym_qpts=[[0, "Γ"], ...].

Tested with Magnopy 0.6.1. Stable periodic modes are supported; invalid native modes, including some nonorthogonal results at exact degeneracies, are rejected without repair. All spin-wave calculations remain in Magnopy.

Try the cubic FM, elliptic variant, and two-site AFM examples:

python exporters/magnopy/examples/export_examples.py
python -m pip install './exporters/magnopy[test]'
python -m pytest exporters/magnopy/tests -q

Format and conventions · Validation