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
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.
Complete the form below and we will send an e-mail message containing a link to the selected article on your behalf