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Enhanced Curie temperatures in Fe and Co magnetic nanoparticle assembly on single-crystalline Al2O3/NiAl(100) with normal metal capping layer

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4 Author(s)
Lin, Wen-Chin ; Department of Physics, National Taiwan University, Taipei 106, Taiwan and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan ; Huang, Po-Chun ; Song, Ker-Jar ; Lin, Minn-Tsong

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The ferromagnetism of Fe nanoparticle assembly on Al2O3/NiAl(100) is observed above 150 K with the coverage larger than 5 ML (monolayer). Cu capping layer induces an enhancement of the Curie temperature (TC) in both Fe and Co magnetic nanoparticle assembly. The TC of Fe nanoparticle assembly with 2 and 6 ML Cu capping layer is enhanced by ∼20 K and even higher, indicating the critical effects of metallic capping layer in such magnetic nanostructures as nanoparticle assembly. The capping layer effect would be crucial for the ex situ measurements and the nanostorage-related applications.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 15 )

Date of Publication:

Apr 2006

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