Exchange-coupled Fe₃O₄/L1₀–FePt bilayer films by controlled oxidation of Fe/Pt multilayer

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• 作者：Xuerang Hu ; Peiwen Wu ; Jun Yuan
• 关键词：Magnetite ; Oxidation ; Exchange-coupled bilayer ; L1₀– ; FePt ; X-ray diffraction ; Transmission electron microscopy ; Magnetic properties
• 刊名：Thin Solid Films
• 出版年：2009
• 出版时间：27 February 2009
• 年：2009
• 卷：517
• 期：8
• 页码：2602-2605
• 全文大小：420 K

文摘

A Fe₃O₄/L1₀–FePt bilayer thin-film magnet was fabricated via a simple one-step process by annealing Fe/Pt multilayer thin films in a N₂ gas flow. X-ray diffraction and plane-view selected-area electron diffraction results are identified with magnetite phase (Fe₃O₄) and L1₀–FePt. Cross-sectional transmission electron microscopy images show the two phases form a bilayer structure. Magnetic hysteresis loops of the bilayer show single phase behavior which is interpreted as a result of the soft Fe₃O₄ phase exchange-coupled with the hard L1₀–FePt phase, consistent with micromagnetic simulation prediction. Such bilayer structure may have potential for coercivity control in high density magnetic recording application.