Thermally induced switching field distribution of a single CoPt dot in a large array

J. B.C. Engelen, M. Delalande, A. J. Le Fèbre, T. Bolhuis, T. Shimatsu, N. Kikuchi, L. Abelmann, J. C. Lodder

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Magnetic dot arrays with perpendicular magnetic anisotropy were fabricated by patterning Co80Pt20-alloy continuous films by means of laser interference lithography. As commonly seen in large dot arrays, there is a large difference in the switching field between dots. Here we investigate the origin of this large switching field distribution, by using the anomalous Hall effect (AHE). The high sensitivity of the AHE permits us to measure the magnetic reversal of individual dots in an array of 80 dots with a diameter of 180nm. By taking 1000 hysteresis loops we reveal the thermally induced switching field distribution SFDT of individual dots inside the array. The SFD T of the first and last switching dots were fitted to an Arrhenius model, and a clear difference in switching volume and magnetic anisotropy was observed between dots switching at low and high fields.

Original languageEnglish
Article number035703
JournalNanotechnology
Volume21
Issue number3
DOIs
Publication statusPublished - 2010 Jan 18

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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