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• W2108495917 abstract "We have developed a method to observe the magnetic field around L10 FePt nanoparticles by in-situ electron holography at elevated temperatures. FePt Nanoparticles with sharp size distribution and chemical homogeneity were synthesized by the reverse micelle method. The as-prepared FePt nanoparticles, which had a disordered fcc structure (A1) with the diameter centered at 6 nm, were coated with a surfactant, dispersed onto a glass plate, and heated in order to undergo a transformation from A1 to an ordered fct structure (L10). The particles were kept separated by the surfactant with their original diameter during annealing. A submicron-size island comprising isolated particles was removed and dispersed on an electron transparent carbon film and then magnetized along one direction. We observed a magnetic field distribution of the submicron-size island of nanoparticles by means of electron holography during heating. Although magnetization decreased between 212°C and 412°C to 25% of the initial strength at 25°C, it increased again during cooling and recovered 67% of its initial strength. However, when an island was heated to 512°C, the magnetization diminished and did not recover again during cooling. The Curie temperature (Tc) of the FePt nanoparticles was determined to be 350°C and was in good agreement with the Tc determined by bulk measurements using a VSM, which was approximately 100°C lower than the reported Tc for bulk Fe55Pt45." @default.
• W2108495917 created "2016-06-24" @default.
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• W2108495917 date "2007-01-01" @default.
• W2108495917 modified "2023-10-03" @default.
• W2108495917 title "<I>In-situ</I> Electron Holography Observation of FePt Nanoparticles at Elevated Temperatures" @default.
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• W2108495917 doi "https://doi.org/10.2320/matertrans.md200703" @default.
• W2108495917 hasPublicationYear "2007" @default.
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