The European Physical Journal Applied Physics

Magnetism and Superconductivity

Multilevel magnetic nanodot arrays with out of plane anisotropy: the role of intra-dot magnetostatic coupling

V. Baltza1, A. Bolleroa1, B. Rodmacqa1, B. Dienya1, J.-P. Jameta2 and J. Ferréa2

DRFMC/SPINTEC (URA CEA/CNRS 2512), CEA Grenoble, 17 Av. Martyrs, 38054 Grenoble Cedex 9, France

Laboratoire de Physique des Solides (UMR CNRS 8502), Université Paris-Sud, 91405 Orsay, France

Abstract

Intra-dot inter-layer magnetostatic coupling have been investigated in trilayers which consist of two [Co/Pt] multilayers with out-of-plane anisotropy and different coercivities separated by a thick Pt layer. For single domain nanodots, the strong intra-dot inter-layer magnetostatic interactions manifest as a shift of the soft layer hysteresis loop. The amplitude of this shift decreases when the size of the dots is increased and/or when the temperature is increased. Satisfactory agreement is found between calculations and experimental results.

(Received January 12 2007)

(Revised April 11 2007)

(Accepted May 16 2007)

(Online publication June 28 2007)

PACS:

  • 75 – Magnetic properties and materials;
  • 75.70.-i – Magnetic properties of thin films, surfaces, and interfaces;
  • 75.60.-d – Domain effects, magnetization curves, and hysteresis;
  • 75.60.Ch – Domain walls and domain structure;
  • 75.75.+a – Magnetic properties of nanostructures
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