Spin glass behaviour of amorphous Ge-Mn alloy thin films

S. H. Song, M. H. Jung, Sang Ho Lim

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Magnetic measurements are performed under ac and dc conditions on well characterized Ge100-xMnx (x in at.%) amorphous thin films prepared by thermal co-evaporation onto oxidized Si or glass substrates at room temperature. M-H hysteresis loops at 5K show that saturation does not occur even at a high applied field of 30 or 50kOe. The temperature dependence of the dc and ac susceptibility shows a cusp with a position and magnitude that vary with the frequency during the ac susceptibility measurements. These results suggest a spin glass behaviour at low temperatures. Two competing magnetic interactions between Mn ions, which are responsible for the spin glass behaviour, are considered to be the direct antiferromagnetic coupling and the indirect ferromagnetic coupling through conduction electrons or holes. Scaling analysis indicates that the indirect ferromagnetic interactions are long range.

Original languageEnglish
Article number036211
JournalJournal of Physics Condensed Matter
Volume19
Issue number3
DOIs
Publication statusPublished - 2007 Jan 24

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Spin glass
spin glass
Glass
magnetic permeability
Thin films
Temperature
thin films
cusps
conduction electrons
magnetic measurement
hysteresis
Magnetic variables measurement
evaporation
interactions
Amorphous films
Hysteresis loops
saturation
scaling
temperature dependence
glass

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Spin glass behaviour of amorphous Ge-Mn alloy thin films. / Song, S. H.; Jung, M. H.; Lim, Sang Ho.

In: Journal of Physics Condensed Matter, Vol. 19, No. 3, 036211, 24.01.2007.

Research output: Contribution to journalArticle

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