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|標題:||Exchange coupling in FePt-FePt3 nanocomposite films||作者:||Lin, K.W.
van Lierop, J.
|關鍵字:||oxide bilayers;anisotropy;bias||Project:||Physica Status Solidi a-Applications and Materials Science||期刊/報告no：:||Physica Status Solidi a-Applications and Materials Science, Volume 204, Issue 12, Page(s) 3991-3994.||摘要:||
In this study, the structural and magnetic properties of exchange coupled nanocomposite FePt-FePt3 films were investigated. X-ray diffraction and transmission electron microscopy results showed that after rapid thermal annealing (600 degrees C for 6 minutes), a phase transformation from [Pt+Fe] into composite FePt-FePt3 phases was obtained. Annealing created an ordered FePt phase that resulted in a large room temperature coercivity (H-c similar to 3200 Oe) compared to the as-deposited film (H-c similar to 20 Oe). While no exchange bias field (H-c similar to 0 Oe) was measured at room temperature, the annealed sample showed significant H-ex similar to -500 Oe at lower temperatures (150 K <= T <= 250 250 K), indicative of exchange coupling between FePt and FePt3. The high blocking temperature (similar to 250 K) indicates FePt3 exhibits an enhanced Neel temperature. Further increasing the annealing temperature to 700 degrees C resulted in a reduction of Hex which is attributed to the transformation of FePt3 into the FePt phase at this higher annealing temperature. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
|Appears in Collections:||材料科學與工程學系|
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