Communication

Room-Temperature Ferromagnetism in ZnO-Encapsulated 1.9 nm FePt3 Nanoparticle–Composite Thin Films with Giant Interfacial Anisotropy

  1. Lei Shen1,†,
  2. Tiejun Zhou1,*,
  3. Rui Qi Wee2,
  4. Kiat Min Cher1,
  5. Hnin Yu Yu Ko1,
  6. Rui Niu2,
  7. Hao Gong2,
  8. Zhimin Yuan1,
  9. Bo Liu1,
  10. Yuan Ping Feng3,*

Article first published online: 18 JAN 2013

DOI: 10.1002/adma.201204135

Issue

Advanced Materials

Advanced Materials

Volume 25, Issue 11, pages 1639–1645, March 20, 2013

Additional Information

How to Cite

Shen, L., Zhou, T., Wee, R. Q., Cher, K. M., Ko, H. Y. Y., Niu, R., Gong, H., Yuan, Z., Liu, B. and Feng, Y. P. (2013), Room-Temperature Ferromagnetism in ZnO-Encapsulated 1.9 nm FePt3 Nanoparticle–Composite Thin Films with Giant Interfacial Anisotropy. Adv. Mater., 25: 1639–1645. doi: 10.1002/adma.201204135

Author Information

  1. 1

    Data Storage Institute, Agency for Science Technology and Research, 5 Engineering Drive 1, Singapore 117608, Singapore

  2. 2

    Department of Materials Science and Engineering, National University of Singapore, Singapore 117576, Singapore

  3. 3

    Department of Physics, 2 Science Drive 3, National University of Singapore, Singapore 117542, Singapore

  1. †

    Department of Physics, National University of Singapore

*Data Storage Institute, Agency for Science Technology and Research, 5 Engineering Drive 1, Singapore 117608, Singapore

Publication History

  1. Issue published online: 11 MAR 2013
  2. Article first published online: 18 JAN 2013
  3. Manuscript Received: 3 OCT 2013
  4. Manuscript Revised: 26 NOV 2012

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Keywords:

  • permanent (hard) ferromagnetism;
  • spin-orbit interaction;
  • giant interfacial anisotropy;
  • superparamagnetic;
  • FePt/ZnO
Thumbnail image of graphical abstract

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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