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Proceedings Paper

From diluted magnetic semiconductors to self-organized nanocolumns of GeMn in germanium
Author(s): S. Tardif; Ing-Song Yu; T. Devillers; M. Jamet; S. Cherifi; J. Cibert; A. Barski; P. Bayle-Guillemaud; E. Bellet-Amalric
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Paper Abstract

While achieving high Curie temperatures (above room temperature) in diluted magnetic semiconductors remains a challenge in the case of well controlled homogeneous alloys, several systems characterized by a strongly inhomogeneous incorporation of the magnetic component appear as promising. Incorporation of manganese into germanium drastically alters the growth conditions, and in certain conditions of low temperature Molecular Beam Epitaxy it leads to the formation of well organized nano-columns of a Mn-rich material, with a crystalline structure in epitaxial relationship with the Mn-poor Germanium matrix. A strong interaction between the Mn atoms in these nanocolums is demonstrated by x-ray absorption spectroscopy, giving rise to a ferromagnetic character as observed through magnetometry and x-ray magnetic circular dichroism. Most interesting, the magneto-transport characteristics of the whole structure strongly depend on the magnetic configuration of the nano-columns.

Paper Details

Date Published: 30 August 2008
PDF: 10 pages
Proc. SPIE 7036, Spintronics, 703615 (30 August 2008); doi: 10.1117/12.798296
Show Author Affiliations
S. Tardif, Institut Néel, CNRS-UJF (France)
Ing-Song Yu, INAC, CEA-Grenoble (France)
T. Devillers, INAC, CEA-Grenoble (France)
M. Jamet, INAC, CEA-Grenoble (France)
S. Cherifi, Institut Néel, CNRS-UJF (France)
J. Cibert, Institut Néel, CNRS-UJF (France)
A. Barski, INAC, CEA-Grenoble (France)
P. Bayle-Guillemaud, INAC, CEA-Grenoble (France)
E. Bellet-Amalric, INAC, CEA-Grenoble (France)

Published in SPIE Proceedings Vol. 7036:
Manijeh Razeghi; Henri-Jean M. Drouhin; Jean-Eric Wegrowe, Editor(s)

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