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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.

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