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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

X-ray diffraction patterns of raw magnetite and irradiated nanoparticles at various laser fluencies. Standard XRD peaks for Fe3O4 and FeO are plotted for reference.
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Figure 3: X-ray diffraction patterns of raw magnetite and irradiated nanoparticles at various laser fluencies. Standard XRD peaks for Fe3O4 and FeO are plotted for reference.

Mentions: X-ray diffraction patterns of particles before and after laser irradiation (Figure 3) revealed a gradual phase transformation from magnetite (Fe3O4) to wustite (FeO) with fluence increase. Starting raw nanoparticles were confirmed to be a pure magnetite phase. The sample after irradiation at 33 mJ/pulse cm2 remained pure magnetite without chemical change, though the crystalline size increased judging from the reduced width and increased intensity of the reflections. Small wustite reflections of (111) at 36.1 and (200) at 42.0 appears as shoulders of magnetite (222) at 37.1 and (400) at 43.1, respectively in the 66-mJ/pulse cm2 result in Figure 3. Those wustite reflections grew and magnetite ones decreased with the irradiation fluence increase. Volume fractions of Fe3O4/FeO, calculated by ratio of highest intensity peaks from XRD data, are summarized in Figure 2.


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)

X-ray diffraction patterns of raw magnetite and irradiated nanoparticles at various laser fluencies. Standard XRD peaks for Fe3O4 and FeO are plotted for reference.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 3: X-ray diffraction patterns of raw magnetite and irradiated nanoparticles at various laser fluencies. Standard XRD peaks for Fe3O4 and FeO are plotted for reference.
Mentions: X-ray diffraction patterns of particles before and after laser irradiation (Figure 3) revealed a gradual phase transformation from magnetite (Fe3O4) to wustite (FeO) with fluence increase. Starting raw nanoparticles were confirmed to be a pure magnetite phase. The sample after irradiation at 33 mJ/pulse cm2 remained pure magnetite without chemical change, though the crystalline size increased judging from the reduced width and increased intensity of the reflections. Small wustite reflections of (111) at 36.1 and (200) at 42.0 appears as shoulders of magnetite (222) at 37.1 and (400) at 43.1, respectively in the 66-mJ/pulse cm2 result in Figure 3. Those wustite reflections grew and magnetite ones decreased with the irradiation fluence increase. Volume fractions of Fe3O4/FeO, calculated by ratio of highest intensity peaks from XRD data, are summarized in Figure 2.

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