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Novel Nanoparticulate Magnetic Materials and Structures

Novel Materials

Ferro-, Ferri-, and Antiferrimagnetic Nanoparticles

  1. David J. Sellmyer,
  2. Yingfan Xu,
  3. Yucheng Sui,
  4. Ralph Skomski

Published Online: 15 DEC 2007

DOI: 10.1002/9780470022184.hmm408

Handbook of Magnetism and Advanced Magnetic Materials

Handbook of Magnetism and Advanced Magnetic Materials

How to Cite

Sellmyer, D. J., Xu, Y., Sui, Y. and Skomski, R. 2007. Novel Nanoparticulate Magnetic Materials and Structures. Handbook of Magnetism and Advanced Magnetic Materials. .

Author Information

  1. University of Nebraska, Lincoln, NE, USA

Publication History

  1. Published Online: 15 DEC 2007

Abstract

The article deals with free and embedded magnetic nanoparticles and with related magnetic structures, such as nanotubes and particulate thin films. The structures are relevant to modern technology, especially magnetic recording, where they have high potential for ultrahigh recording densities. After an introduction to magnetic recording, the focus is on relatively new preparation methods such as cluster deposition of magnetic metallic particles and synthesis in porous templates. The particles, tubes, and wires have dimensions between 1 nm and several 100 nm and exhibit a broad range of structural and magnetic properties. Present-day recording media are longitudinal but soon there will be a transition to perpendicular recording media using very small grains for noise considerations and highly anisotropic materials to ensure thermal stability of the stored information. The considered materials range from transition-metal elements and oxides, such as Fe, Co, and magnetite, to tetragonal FePt and rare-earth transition-metal (RE-TM) alloys.

Keywords:

  • cluster deposition;
  • coercivity;
  • electrodeposition;
  • magnetic recording;
  • magnetic thin films;
  • nanotubes;
  • nanowires;
  • thermal stability