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 journalArticle

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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)510-514
Number of pages5
JournalJournal of Electronic Materials
Volume29
Issue number5
StatePublished - May 1 2000

Fingerprint

Coercive force
Semiconductor quantum dots
coercivity
Magnetic properties
quantum dots
magnetic properties
Aluminum Oxide
room temperature
Electrodeposition
electrodeposition
Temperature
Alumina
aluminum oxides
spacing
Annealing
Fabrication
fabrication
annealing

ASJC Scopus subject areas

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

Cite this

Size dependence of the magnetic properties of electrochemically self-assembled Fe quantum dots. / Menon, L.; Zheng, M.; Zeng, H.; Bandyopadhyay, S.; Sellmyer, D. J.

In: Journal of Electronic Materials, Vol. 29, No. 5, 01.05.2000, p. 510-514.

Research output: Contribution to journalArticle

Menon, L. ; Zheng, M. ; Zeng, H. ; Bandyopadhyay, S. ; Sellmyer, D. J. / Size dependence of the magnetic properties of electrochemically self-assembled Fe quantum dots. In: Journal of Electronic Materials. 2000 ; Vol. 29, No. 5. pp. 510-514.
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