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Issue 4, 2019
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Iron doped gold cluster nanomagnets: ab initio determination of barriers for demagnetization

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Abstract

Magnetic properties of small- and nano-sized iron doped gold clusters are calculated at the level of second order multireference perturbation theory. We first assess the methodology for small Au6Fe and Au7Fe clusters, which are representative of even and odd electron count systems. We find that larger active spaces are needed for the odd electron count system, Au7Fe, which exhibits isotropic magnetization behaviour. On the other hand, the even electron count system, Au6Fe, exhibits strong axial magnetic anisotropy. We then apply this methodology to the tetrahedral and truncated pyramidal nano-sized Au19Fe (with S = 3/2) and Au18Fe (with S = 2) clusters. We find that face substitutions result in the most stable structures, followed by edge and corner substitutions. However, for Au18Fe, corner substitution results in strong magnetic anisotropy and a large barrier for demagnetization while face substitution does not. Thus, although corner and face substituted Au18Fe have the same spin, only corner substituted Au18Fe can act as a single nanoparticle magnet.

Graphical abstract: Iron doped gold cluster nanomagnets: ab initio determination of barriers for demagnetization

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Publication details

The article was received on 21 Nov 2018, accepted on 12 Feb 2019 and first published on 12 Feb 2019


Article type: Paper
DOI: 10.1039/C8NA00359A
Nanoscale Adv., 2019,1, 1553-1559
  • Open access: Creative Commons BY license
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    Iron doped gold cluster nanomagnets: ab initio determination of barriers for demagnetization

    C. Ehlert and I. P. Hamilton, Nanoscale Adv., 2019, 1, 1553
    DOI: 10.1039/C8NA00359A

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