LNONCOLLINEAR: Difference between revisions
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initialises the magnetic moment on the first atom in the x-direction, and on the second atom in the y direction. Mind, that the {{TAG|MAGMOM}} line supplies initial magnetic moments only if {{TAG|ICHARG}} = 2, or if the {{TAG|CHGCAR}} file contains only charge but no magnetisation density. | initialises the magnetic moment on the first atom in the x-direction, and on the second atom in the y direction. Mind, that the {{TAG|MAGMOM}} line supplies initial magnetic moments only if {{TAG|ICHARG}} = 2, or if the {{TAG|CHGCAR}} file contains only charge but no magnetisation density. | ||
== Related | == Related tags and articles == | ||
{{TAG|MAGMOM}}, | {{TAG|MAGMOM}}, | ||
{{TAG|ICHARG}}, | {{TAG|ICHARG}}, | ||
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[[Category:INCAR]][[Category:Magnetism]][[Category:Noncollinear magnetism]] | [[Category:INCAR tag]][[Category:Magnetism]][[Category:Noncollinear magnetism]] | ||
Revision as of 14:37, 8 April 2022
LNONCOLLINEAR = .TRUE. | .FALSE.
Default: LNONCOLLINEAR = .FALSE.
Description: LNONCOLLINEAR specifies whether fully non-collinear magnetic calculations are performed.
Supported as of VASP.4.5.
Setting LNONCOLLINEAR = .TRUE. in the INCAR file allows to perform fully non-collinear magnetic structure calculations. VASP is capable of reading WAVECAR and CHGCAR files from previous non-magnetic or collinear calculations, it is however not possible to rotate the magnetic field locally on selected atoms.
Hence, in practice, we recommend to perform non-collinear calculations in two steps:
- First, calculate the non magnetic groundstate and generate a WAVECAR and CHGCAR file.
- Second, read the WAVECAR and CHGCAR file, and supply initial magnetic moments by means of the MAGMOM tag (compare MAGMOM).
For a non-collinear setup, three values must be supplied for each ion in the MAGMOM line. The three entries correspond to the initial local magnetic moment for each ion in x, y and z direction respectively. The line
MAGMOM = 1 0 0 0 1 0
initialises the magnetic moment on the first atom in the x-direction, and on the second atom in the y direction. Mind, that the MAGMOM line supplies initial magnetic moments only if ICHARG = 2, or if the CHGCAR file contains only charge but no magnetisation density.