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Low-Temperature Solution Synthesis of Chemically Functional Ferromagnetic FePtAu Nanoparticles

机译:化学功能性铁磁FePtAu纳米粒子的低温溶液合成

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摘要

Magnetic nanoparticles are of great scientific and technological interest. The application of ferromagnetic nanoparticles for high-density data storage has great potential, but energy efficient synthesis of uniform, isolated, and patternable nanoparticles that remain ferromagnetic at room temperature is not trivial. Here, we present a low-temperature solution synthesis method for FePtAu nanoparticles that addresses all those issues and therefore can be regarded as an important step toward applications. We show that the onset of the chemically ordered face-centered tetragonal (L1(0)) phase is obtained for thermal annealing temperatures as low as 150 degrees C. Large uniaxial magnetic anisotropy (10(7) erg/cm(3)) and a high long-range order parameter have been obtained. Our low-temperature solution annealing leaves the organic ligands intact, so that the possibility for postanneal monolayer formation and chemically assisted patterning on a surface is maintained.
机译:磁性纳米粒子具有重大的科学技术意义。铁磁纳米粒子在高密度数据存储中的应用具有巨大潜力,但是在室温下仍能保持铁磁的均匀,隔离和可构图的纳米粒子的高能效合成并非易事。在这里,我们提出了一种用于FePtAu纳米颗粒的低温溶液合成方法,该方法解决了所有这些问题,因此可以视为迈向应用的重要一步。我们表明,对于低至150摄氏度的热退火温度,可以获得化学有序的面心四方(L1(0))相的开始。大单轴磁各向异性(10(7)erg / cm(3))和已获得高的远程阶数参数。我们的低温溶液退火使有机配体完整无损,因此可以保持在表面上进行退火后单层形成和化学辅助构图的可能性。

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