First-principles studies of interlayer exchange coupling in (Ga, Co)N-based diluted magnetic semiconductor multilayers

M. Luo, H.H. Yin and Z.Q. Zhu

Physica A: Statistical Mechanics and its Applications, 2012, vol. 391, issue 21, 5090-5094

Abstract: Interlayer exchange coupling (IEC) in a series model diluted magnetic semiconductor (DMS) multilayer consisting of two magnetic (Ga, Co)N layers separated by non-doped or Mg-doped GaN non-magnetic spacers has been studied by first-principles calculations. The effects of the spacer thickness and hole doping to the IEC were studied systematically. It is observed that (1) for the GaN spacers without Mg doping, the IEC between two magnetic (Ga, Co)N layers is always ferromagnetic, which is clarified as an intrinsic character of the Ruderman–Kittle–Kasuya–Yoshida (RKKY) interaction based on a two-band model for a gapped system; and (2) for the Mg-doped GaN spacers, the IEC is tunable from ferromagnetic to antiferromagnetic by varying the spacer’s thickness and the dopant’s site.

Keywords: Diluted magnetic semiconductor; First-principles calculations; Multilayer; Interlayer exchange coupling; Antiferromagnetic coupling; Carrier (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:391:y:2012:i:21:p:5090-5094

DOI: 10.1016/j.physa.2012.05.067

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