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Lei Shen, Tiejun Zhou, Rui Qi Wee, Kiat Min Cher, Hnin Yu Yu Ko, Rui Niu, Hao Gong, Zhimin Yuan, Bo Liu and Yuan Ping Feng Room-Temperature Ferromagnetism in ZnO-Encapsulated 1.9 nm FePt3 Nanoparticle–Composite Thin Films with Giant Interfacial Anisotropy Advanced Materials 25

Version of Record online: 18 JAN 2013 | DOI: 10.1002/adma.201204135

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As synthesized 1.9-nm FePt3 nanoparticles are superparamagnetic at room temperature. Coating those nanoparticles with ZnO renders them permanently ferromagnetic with coercivity field of 650 Oe at room temperature. First-principles calculations indicate that giant interfacial anisotropy, induced by the strong spin-orbit interaction of enhanced orbit momentum of Fe, overcomes the superparamagnetic limit, leading to exceptional room-temperature permanent ferromagnetism. The findings are important for the understanding of the origin of permanent ferromagnetism at ultrasmall size and critical for ultrahigh density recording and information processing.

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