Two-dimensional percolation phase transition in ultrathin Co/Cu(110)

Near the critical region for the onset of ferromagnetic order, the magnetic susceptibility χ follows a power law with a critical exponent γ=2.39±0.08, in excellent agreement with the theoretical value for a perfect two-dimensional geometric percolation phase transition. Scanning tunneling microscopy...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of applied physics 1999-04, Vol.85 (8), p.6094-6096
Hauptverfasser: Hope, S., Tselepi, M., Gu, E., Parker, T. M., Bland, J. A. C.
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Near the critical region for the onset of ferromagnetic order, the magnetic susceptibility χ follows a power law with a critical exponent γ=2.39±0.08, in excellent agreement with the theoretical value for a perfect two-dimensional geometric percolation phase transition. Scanning tunneling microscopy studies reveal that the Co grows via the formation of three-dimensional elongated island structures, forming an array of Co “nanomagnets.” The ordering transition is a consequence of direct exchange developing between Co islands. The in-plane uniaxial anisotropy in the ferromagnetic phase is predominantly attributed to the internal dipolar field of the Co islands.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.370272