Abstract
The influence of Mn, Fe, Si vacancies and Al-doped 4H–SiC on the electronic structures and magnetic properties are studied by first principles calculations. The results indicate both Mn and Fe monodoped can induce magnetism. Additionally, the phenomenon of ferromagnetism is observed in (Mn, Fe)-codoped 4H–SiC system, mainly contributed by Mn and Fe atoms. The ferromagnetic mechanism is that C atoms act as a medium between Mn atom and Fe atom, forming a Mn–C–Si–C–Fe coupling chain. The Si vacancies have a weaker effect on inducing ferromagnetism and Al atom doped has no obvious effect on the magnetic properties. Our study provides an effective method of tuning magnetism in 4H–SiC.
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