Size dependence of the magnetic properties of electrochemically self-assembled Fe quantum dots

L. Menon, M. Zheng, H. Zeng, S. Bandyopadhyay, D. J. Sellmyer

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

A quasi-periodic array of Fe quantum dots of cylindrical shape has been synthesized by electrodeposition of Fe in porous alumina. By controlling the fabrication parameters, we have controlled the length, diameter, and spacing of the dots. The magnetic properties are shown to depend on these parameters. It has been found that at room temperature, there exists a critical diameter of the dots for which the coercivity is a maximum. The largest value of coercivity obtained at room temperature is 2640 Oe which rises to 2900 Oe on annealing. At a low temperature of 5 K, an increase in coercivity is observed for most of the samples. The largest value is 3800 Oe which rises to a value of 4100 Oe in the corresponding annealed counterpart. At 5 K, no maximum is seen in the coercivity as a function of diameter. Instead, the coercivity is found to decrease with increasing diameter. This dependence of the coercivity on diameter is discussed in terms of localized reversal effects.

Original languageEnglish (US)
Pages (from-to)510-515
Number of pages6
JournalJournal of Electronic Materials
Volume29
Issue number5
DOIs
StatePublished - May 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Size dependence of the magnetic properties of electrochemically self-assembled Fe quantum dots'. Together they form a unique fingerprint.

Cite this