Magnetic Hardness of Fe60Pt40 Nanoparticles Controlled by Surface Chemistry

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• 作者：David Serantes ; Marina Spasova ; Daniel Baldomir ; Michael Farle ; Veronica Salgueirino
• 刊名：Chemistry of Materials
• 出版年：2010
• 出版时间：July 13, 2010
• 年：2010
• 卷：22
• 期：13
• 页码：4103-4110
• 全文大小：817K
• 年卷期：v.22,no.13(July 13, 2010)
• ISSN：1520-5002

文摘

Fe₆₀Pt₄₀ nanoparticles stabilized by oleic acid/oleylamine or tetramethylammonium hydroxide and self-assembled in 3D dispersions permit a detailed analysis of the competition of surface, finite-size effects and magnetic interparticle interactions which controls the collective macroscopic magnetic behavior. Temperature dependent magnetometry demonstrates that for FePt nanoparticles with identical size distribution but different surface chemistry, substantial differences of the effective magnetic anisotropy exist and can be understood by comparison with different theoretical models. Finally, a model yielding quantitative data for the competing intrinsic magnetic parameters of complex core−shell nanoparticles is derived.