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Controlling exchange bias in Fe3O4/FeO composite particles prepared by pulsed laser irradiation.

Swiatkowska-Warkocka Z, Kawaguchi K, Wang H, Katou Y, Koshizaki N - Nanoscale Res Lett (2011)

Bottom Line: Through tuning the laser fluence, the Fe3O4/FeO phase ratio can be precisely controlled, and the magnetic properties of final products can also be regulated.This work presents a successful example of the fabrication of ferro (ferri) (FM)/antiferromagnetic (AFM) systems with high chemical stability.The results show this novel simple method as widely extendable to various FM/AFM nanocomposite systems.

View Article: PubMed Central - HTML - PubMed

Affiliation: Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305-8565 Ibaraki, Japan. zaneta.swiatkowska@aist.go.jp.

ABSTRACT
Spherical iron oxide nanocomposite particles composed of magnetite and wustite have been successfully synthesized using a novel method of pulsed laser irradiation in ethyl acetate. Both the size and the composition of nanocomposite particles are controlled by laser irradiation condition. Through tuning the laser fluence, the Fe3O4/FeO phase ratio can be precisely controlled, and the magnetic properties of final products can also be regulated. This work presents a successful example of the fabrication of ferro (ferri) (FM)/antiferromagnetic (AFM) systems with high chemical stability. The results show this novel simple method as widely extendable to various FM/AFM nanocomposite systems.

No MeSH data available.


Related in: MedlinePlus

XPS Fe 2p depth profile of the Fe3O4/FeO particles fabricated at 177 mJ/pulse cm2.
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Figure 4: XPS Fe 2p depth profile of the Fe3O4/FeO particles fabricated at 177 mJ/pulse cm2.

Mentions: Further information about the iron oxide formation during laser irradiation can be gained by analyzing XPS data. For the sake of simplicity, just the XPS Fe 2p depth profile of sample obtained after irradiation with fluence 177 mJ/pulse cm2 is shown as being representative of the behaviour of all composite particles (Figure 4). All spectra for pre-sputtering and post-sputtering shows peaks positioned around 711 and 724 eV, which are typical core level spectra of Fe3O4 and around 710 and 723 eV, which are characteristic for Fe2+ ions in FeO [20]. These results are qualitatively consistent to the XRD measurements. On the basis of TEM and XPS results, we can suppose that composite particles obtained by pulsed laser irradiation reveal aggregated structures.


Controlling exchange bias in Fe3O4/FeO composite particles prepared by pulsed laser irradiation.

Swiatkowska-Warkocka Z, Kawaguchi K, Wang H, Katou Y, Koshizaki N - Nanoscale Res Lett (2011)

XPS Fe 2p depth profile of the Fe3O4/FeO particles fabricated at 177 mJ/pulse cm2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211284&req=5

Figure 4: XPS Fe 2p depth profile of the Fe3O4/FeO particles fabricated at 177 mJ/pulse cm2.
Mentions: Further information about the iron oxide formation during laser irradiation can be gained by analyzing XPS data. For the sake of simplicity, just the XPS Fe 2p depth profile of sample obtained after irradiation with fluence 177 mJ/pulse cm2 is shown as being representative of the behaviour of all composite particles (Figure 4). All spectra for pre-sputtering and post-sputtering shows peaks positioned around 711 and 724 eV, which are typical core level spectra of Fe3O4 and around 710 and 723 eV, which are characteristic for Fe2+ ions in FeO [20]. These results are qualitatively consistent to the XRD measurements. On the basis of TEM and XPS results, we can suppose that composite particles obtained by pulsed laser irradiation reveal aggregated structures.

Bottom Line: Through tuning the laser fluence, the Fe3O4/FeO phase ratio can be precisely controlled, and the magnetic properties of final products can also be regulated.This work presents a successful example of the fabrication of ferro (ferri) (FM)/antiferromagnetic (AFM) systems with high chemical stability.The results show this novel simple method as widely extendable to various FM/AFM nanocomposite systems.

View Article: PubMed Central - HTML - PubMed

Affiliation: Nanosystem Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305-8565 Ibaraki, Japan. zaneta.swiatkowska@aist.go.jp.

ABSTRACT
Spherical iron oxide nanocomposite particles composed of magnetite and wustite have been successfully synthesized using a novel method of pulsed laser irradiation in ethyl acetate. Both the size and the composition of nanocomposite particles are controlled by laser irradiation condition. Through tuning the laser fluence, the Fe3O4/FeO phase ratio can be precisely controlled, and the magnetic properties of final products can also be regulated. This work presents a successful example of the fabrication of ferro (ferri) (FM)/antiferromagnetic (AFM) systems with high chemical stability. The results show this novel simple method as widely extendable to various FM/AFM nanocomposite systems.

No MeSH data available.


Related in: MedlinePlus