Control of magnetic behavior in Fe3O4 nanostructures

Seung Pil Ko; Joon Young Soh; Young Keun Kim

doi:10.1109/TMAG.2005.854907

Control of magnetic behavior in Fe₃O₄ nanostructures

Seung Pil Ko, Joon Young Soh, Young Keun Kim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Hexagonally well-ordered nanoporous anodized aluminum oxide (AAO) templates were synthesized by electrochemical method. Then, magnetite (Fe ₃O₄) 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 language	English
Pages (from-to)	3304-3306
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	41
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2005.854907
Publication status	Published - 2005 Oct

Keywords

Anodized aluminum oxide membrane
Magnetite
Nanoparticle arrays
Nanostructures

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2005.854907

Cite this

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title = "Control of magnetic behavior in Fe3O4 nanostructures",

abstract = "Hexagonally well-ordered nanoporous anodized aluminum oxide (AAO) templates were synthesized by electrochemical method. Then, magnetite (Fe 3O4) 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.",

keywords = "Anodized aluminum oxide membrane, Magnetite, Nanoparticle arrays, Nanostructures",

author = "Ko, {Seung Pil} and Soh, {Joon Young} and Kim, {Young Keun}",

note = "Funding Information: This work was supported by the Korea Research Foundation Grant KRF-2004-005-D00057, by the Grany A 050750 of the Korea Health 21 R&D Project, by Grant R01-2003-00-10644-0 from the Basic Research Program of the Korea Science and Engineering Foundation, and by the National Research Laboratory Program.",

year = "2005",

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language = "English",

volume = "41",

pages = "3304--3306",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

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T1 - Control of magnetic behavior in Fe3O4 nanostructures

AU - Ko, Seung Pil

AU - Soh, Joon Young

AU - Kim, Young Keun

N1 - Funding Information: This work was supported by the Korea Research Foundation Grant KRF-2004-005-D00057, by the Grany A 050750 of the Korea Health 21 R&D Project, by Grant R01-2003-00-10644-0 from the Basic Research Program of the Korea Science and Engineering Foundation, and by the National Research Laboratory Program.

PY - 2005/10

Y1 - 2005/10

N2 - Hexagonally well-ordered nanoporous anodized aluminum oxide (AAO) templates were synthesized by electrochemical method. Then, magnetite (Fe 3O4) 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.

AB - Hexagonally well-ordered nanoporous anodized aluminum oxide (AAO) templates were synthesized by electrochemical method. Then, magnetite (Fe 3O4) 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.

KW - Anodized aluminum oxide membrane

KW - Magnetite

KW - Nanoparticle arrays

KW - Nanostructures

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