Hi! you have to perform first a magnetic stability of the studied material.
Dear Ali,
The basic Dirac semimetals have time reversal and inversion symmetries protecting the Dirac points of touching the valence and conduction bands. Theoretically one can get Wey or/and nodal-line semimetals by breaking one of such dicrete symmetries. The magnetic field obviously would break the time reversal symmetry but this would not be a real problem for these new kind of materials. Thus, in principle there are not problems although most of the these topological materials are not magnetic.
Yes, a magnetic material can be a nodal line semimetal. In topological nodal line semimetals the band crossing points form closed loops instead of discrete points in the momentum space. Recently, a nodal line semimetal behavior is found in the magnetic topological semimetal state in the ferromagnetic half-metal compounds Co2TiX (X=Si, Ge, or Sn) with Curie temperatures higher than 350 K.
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