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Synthesis and Characteristics of FePt Nanoparticle Films Under In Situ-Applied Magnetic Field.

Qian X, Gao MY, Li AD, Zhou XY, Liu XJ, Cao YQ, Li C, Wu D - Nanoscale Res Lett (2016)

Bottom Line: The effect of in situ-applied magnetic field on the structure, morphology, and magnetic properties of FePt nanoparticle films was characterized.It is found that the applied magnetic field during the chemical synthesis of FePt nanoparticles plays a key role in the crystallinity and magnetic property of FePt nanoparticle films.The applied magnetic field during the synthesis of FePt nanoparticles not only significantly improves the nanoparticles' c-axis preferred orientation but also benefits the phase transition of FePt nanoparticles from face-centered cubic to face-centered tetragonal structure during the annealing process.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

ABSTRACT
In situ external magnetic field was applied during the synthesis of FePt nanoparticles via a chemical solution method. FePt nanoparticle films were prepared on Si by a drop-coating method with and without a magnetic field. Annealing at 700 °C in reductive atmosphere was explored to obtain ferromagnetic FePt L10 phase. The effect of in situ-applied magnetic field on the structure, morphology, and magnetic properties of FePt nanoparticle films was characterized. It is found that the applied magnetic field during the chemical synthesis of FePt nanoparticles plays a key role in the crystallinity and magnetic property of FePt nanoparticle films. As-synthesized FePt nanoparticles under the magnetic field are monodispersed and can be self-assembled over a larger area by a dropping method. The applied magnetic field during the synthesis of FePt nanoparticles not only significantly improves the nanoparticles' c-axis preferred orientation but also benefits the phase transition of FePt nanoparticles from face-centered cubic to face-centered tetragonal structure during the annealing process. The FePt nanoparticle films derived under magnetic field also show some magnetic anisotropy.

No MeSH data available.


The apparatus schematics of a chemical synthesis of FePt nanoparticles and b drop-coating process for FePt nanoparticle films under in situ-applied magnetic field
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Fig1: The apparatus schematics of a chemical synthesis of FePt nanoparticles and b drop-coating process for FePt nanoparticle films under in situ-applied magnetic field

Mentions: FePt nanoparticles were synthesized through a modified polyol process under a gentle flow of pure nitrogen (N2) [32]. Typically, the FePt nanoparticles were prepared via chemical reduction of Pt(acac)2 and thermal decomposition of Fe(CO)5 in the presence of oleic acid (OA) and oleylamine (OAm) at 220 °C under in situ-applied magnetic field, as shown in Fig. 1a. Two SmCo permanent magnets (5 × 5 cm2) were placed vertically to yield external magnetic field H of 6000 Oe.Fig. 1


Synthesis and Characteristics of FePt Nanoparticle Films Under In Situ-Applied Magnetic Field.

Qian X, Gao MY, Li AD, Zhou XY, Liu XJ, Cao YQ, Li C, Wu D - Nanoscale Res Lett (2016)

The apparatus schematics of a chemical synthesis of FePt nanoparticles and b drop-coating process for FePt nanoparticle films under in situ-applied magnetic field
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940308&req=5

Fig1: The apparatus schematics of a chemical synthesis of FePt nanoparticles and b drop-coating process for FePt nanoparticle films under in situ-applied magnetic field
Mentions: FePt nanoparticles were synthesized through a modified polyol process under a gentle flow of pure nitrogen (N2) [32]. Typically, the FePt nanoparticles were prepared via chemical reduction of Pt(acac)2 and thermal decomposition of Fe(CO)5 in the presence of oleic acid (OA) and oleylamine (OAm) at 220 °C under in situ-applied magnetic field, as shown in Fig. 1a. Two SmCo permanent magnets (5 × 5 cm2) were placed vertically to yield external magnetic field H of 6000 Oe.Fig. 1

Bottom Line: The effect of in situ-applied magnetic field on the structure, morphology, and magnetic properties of FePt nanoparticle films was characterized.It is found that the applied magnetic field during the chemical synthesis of FePt nanoparticles plays a key role in the crystallinity and magnetic property of FePt nanoparticle films.The applied magnetic field during the synthesis of FePt nanoparticles not only significantly improves the nanoparticles' c-axis preferred orientation but also benefits the phase transition of FePt nanoparticles from face-centered cubic to face-centered tetragonal structure during the annealing process.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, College of Engineering and Applied Sciences, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, People's Republic of China.

ABSTRACT
In situ external magnetic field was applied during the synthesis of FePt nanoparticles via a chemical solution method. FePt nanoparticle films were prepared on Si by a drop-coating method with and without a magnetic field. Annealing at 700 °C in reductive atmosphere was explored to obtain ferromagnetic FePt L10 phase. The effect of in situ-applied magnetic field on the structure, morphology, and magnetic properties of FePt nanoparticle films was characterized. It is found that the applied magnetic field during the chemical synthesis of FePt nanoparticles plays a key role in the crystallinity and magnetic property of FePt nanoparticle films. As-synthesized FePt nanoparticles under the magnetic field are monodispersed and can be self-assembled over a larger area by a dropping method. The applied magnetic field during the synthesis of FePt nanoparticles not only significantly improves the nanoparticles' c-axis preferred orientation but also benefits the phase transition of FePt nanoparticles from face-centered cubic to face-centered tetragonal structure during the annealing process. The FePt nanoparticle films derived under magnetic field also show some magnetic anisotropy.

No MeSH data available.