Magnetocrystalline anisotropy of partially ordered Fe-Pt nanoparticles directly synthesized with microwave-polyol method

We report direct synthesis of chemically ordered Fe-Pt nanoparticles using microwave irradiation during polyol reaction at 250/spl deg/C without any post-synthesis treatments. Mo/spl uml/ssbauer analysis exhibits the Fe-Pt nanoparticles having partially ordered L1/sub 0/ structure, and the fraction...

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Published inIEEE transactions on magnetics Vol. 41; no. 10; pp. 3880 - 3882
Main Authors Kitamoto, Y., Minami, R., Shibata, Y., Chikata, T., Kato, S.
Format Journal Article Conference Proceeding
LanguageEnglish
Published New York, NY IEEE 01.10.2005
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Anisotropic magnetoresistance
Chemical analysis
Coercive force
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Iron
Magnetic analysis
Magnetic anisotropy
Magnetism
Magnetization decay
magnetocrystalline anisotropy
Materials science
Microwave theory and techniques
MÖssbauer spectroscopy
nanoparticle
Nanoparticles
ordered alloy
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
Saturation magnetization
Nanoparticles
Magnetization
Ordered alloy
Magnetic anisotropy
Mossbauer spectroscopy
Microwave irradiation
Moessbauer spectroscopy
nanoparticle
Magnetization decay
magnetocrystalline anisotropy
Magnetic properties
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Abstract We report direct synthesis of chemically ordered Fe-Pt nanoparticles using microwave irradiation during polyol reaction at 250/spl deg/C without any post-synthesis treatments. Mo/spl uml/ssbauer analysis exhibits the Fe-Pt nanoparticles having partially ordered L1/sub 0/ structure, and the fraction of Fe atoms in the chemically ordered L1/sub 0/ structure to the total amount of Fe atoms is 57%. Coercivity and saturation magnetization of the partially ordered Fe-Pt nanoparticles are 3.0 kOe and 57 emu/g at room temperature, respectively. An evaluation of the anisotropy-field distribution using Flanders-Shtrikman method reveals that the Fe-Pt sample includes nanoparticles with anisotropy fields much lower than the anisotropy field H/sub k//sup Wr/ of 85 kOe obtained by rotational hysteresis loss measurements.
AbstractList We report direct synthesis of chemically ordered Fe-Pt nanoparticles using microwave irradiation during polyol reaction at 250/spl deg/C without any post-synthesis treatments. Mo/spl uml/ssbauer analysis exhibits the Fe-Pt nanoparticles having partially ordered L1/sub 0/ structure, and the fraction of Fe atoms in the chemically ordered L1/sub 0/ structure to the total amount of Fe atoms is 57%. Coercivity and saturation magnetization of the partially ordered Fe-Pt nanoparticles are 3.0 kOe and 57 emu/g at room temperature, respectively. An evaluation of the anisotropy-field distribution using Flanders-Shtrikman method reveals that the Fe-Pt sample includes nanoparticles with anisotropy fields much lower than the anisotropy field H/sub k//sup Wr/ of 85 kOe obtained by rotational hysteresis loss measurements.
We report direct synthesis of chemically ordered Fe-Pt nanoparticles using microwave irradiation during polyol reaction at 250 deg C without any post-synthesis treatments. Mo/spl uml/ssbauer analysis exhibits the Fe-Pt nanoparticles having partially ordered L1/sub 0/ structure, and the fraction of Fe atoms in the chemically ordered L1/sub 0/ structure to the total amount of Fe atoms is 57%. Coercivity and saturation magnetization of the partially ordered Fe-Pt nanoparticles are 3.0 kOe and 57 emu/g at room temperature, respectively. An evaluation of the anisotropy-field distribution using Flanders-Shtrikman method reveals that the Fe-Pt sample includes nanoparticles with anisotropy fields much lower than the anisotropy field H/sub k//sup Wr/ of 85 kOe obtained by rotational hysteresis loss measurements.
Author Minami, R.
Shibata, Y.
Kitamoto, Y.
Kato, S.
Chikata, T.
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Cites_doi 10.1063/1.1558258
10.1109/TMAG.2003.815590
10.1063/1.1728489
10.1126/science.287.5460.1989
10.1143/JJAP.42.L350
10.1016/0925-8388(94)90087-6
10.1063/1.1669352
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Issue 10
Keywords Nanoparticles
Magnetization
Ordered alloy
Magnetic anisotropy
Mossbauer spectroscopy
Microwave irradiation
Moessbauer spectroscopy
nanoparticle
Magnetization decay
magnetocrystalline anisotropy
Magnetic properties
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References ref7
ref4
ref3
ref6
goto (ref5) 1994; 204
ref2
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  article-title: monodisperse fept nanoparticles and ferromagnetic fept nanocrystal superlattices
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  doi: 10.1143/JJAP.42.L350
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  article-title: effect of atomic order-disorder on $^{57}$fe hyperfine structure in fe$_{64}$ pt$_{36}$ alloy
  publication-title: J Alloys Comp
  doi: 10.1016/0925-8388(94)90087-6
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SubjectTerms Anisotropic magnetoresistance
Chemical analysis
Coercive force
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Iron
Magnetic analysis
Magnetic anisotropy
Magnetism
Magnetization decay
magnetocrystalline anisotropy
Materials science
Microwave theory and techniques
MÖssbauer spectroscopy
nanoparticle
Nanoparticles
ordered alloy
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
Saturation magnetization
Title Magnetocrystalline anisotropy of partially ordered Fe-Pt nanoparticles directly synthesized with microwave-polyol method
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