Spin glass behaviour of amorphous Ge-Mn alloy thin films

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

    Research output: Contribution to journalArticlepeer-review

    10 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

    ASJC Scopus subject areas

    • General Materials Science
    • Condensed Matter Physics

    Fingerprint

    Dive into the research topics of 'Spin glass behaviour of amorphous Ge-Mn alloy thin films'. Together they form a unique fingerprint.

    Cite this