Element specific characterization of heterogeneous magnetism in (Ga,Fe)N films

I. A. Kowalik; A. Persson; M. Á. Niño; A. Navarro-Quezada; B. Faina; A. Bonanni; T. Dietl; D. Arvanitis

doi:10.1103/PhysRevB.85.184411

Element specific characterization of heterogeneous magnetism in (Ga,Fe)N films

Materials Science 2014-01-13 v1

Authors: I. A. Kowalik , A. Persson , M. Á. Niño , A. Navarro-Quezada , B. Faina , A. Bonanni , T. Dietl , D. Arvanitis

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Abstract

We employ x-ray spectroscopy to characterize the distribution and magnetism of particular alloy constituents in (Ga,Fe)N films grown by metal organic vapor phase epitaxy. Furthermore, photoelectron microscopy gives direct evidence for the aggregation of Fe ions, leading to the formation of Fe-rich nanoregions adjacent to the samples surface. A sizable x-ray magnetic circular dichroism (XMCD) signal at the Fe L-edges in remanence and at moderate magnetic fields at 300 K links the high temperature ferromagnetism with the Fe(3d) states. The XMCD response at the N K-edge highlights that the N(2p) states carry considerable spin polarization. We conclude that FeN{\delta} nanocrystals, with \delta > 0.25, stabilize the ferromagnetic response of the films.

Keywords

(ga,fe)n films x-ray magnetic circular dichroism ferromagnetism fe aggregation nanocrystals element specific characterization metal organic vapor phase epitaxy

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@article{arxiv.1011.0847,
  title  = {Element specific characterization of heterogeneous magnetism in (Ga,Fe)N films},
  author = {I. A. Kowalik and A. Persson and M. Á. Niño and A. Navarro-Quezada and B. Faina and A. Bonanni and T. Dietl and D. Arvanitis},
  journal= {arXiv preprint arXiv:1011.0847},
  year   = {2014}
}

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4 pages, 3 figures, 1 table

Element specific characterization of heterogeneous magnetism in (Ga,Fe)N films

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