Control of magnetic behavior in Fe 3O 4 nanostructures

Seung Pil Ko, Joon Young Soh, Young Keun Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Hexagonally well-ordered nanoporous anodized aluminum oxide (AAO) templates were synthesized by electrochemical method. Then, magnetite (Fe 3O 4) nanoparticles of 8-15-nm diameter were filled in the pores of the AAO template, and then the morphology and magnetic properties were characterized. Vibrating sample magnetometer measurement indicated that the nanoparticles inside AAO showed superparamagnetic behavior at as-filled state. But after annealing at 600°C for 2 hr, the nanostructure (i.e., an assembly of nanoparticles) exhibited coercivity of 80 Oe. Superconducting quantum interference measurement device data showed that after annealing the blocking temperature was above 300 K. Thus, the annealed magnetite nanostructures possessed ferrimagnetism.

Original languageEnglish
Pages (from-to)3304-3306
Number of pages3
JournalIEEE Transactions on Magnetics
Volume41
Issue number10
DOIs
Publication statusPublished - 2005 Oct

Keywords

  • Anodized aluminum oxide membrane
  • Magnetite
  • Nanoparticle arrays
  • Nanostructures

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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