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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...

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Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles
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Published on: May 26, 2016

NiFe nanoparticles: a soft magnetic material?

Olivier Margeat1, Diana Ciuculescu, Pierre Lecante

  • 1Laboratoire de Chimie de Coordination, UPR 8241-CNRS, 205, Route de Narbonne, 31077 Toulouse Cedex 04, France.

Small (Weinheim an Der Bergstrasse, Germany)
|February 8, 2007
PubMed
Summary

Synthesized polytetrahedral nickel-iron (NiFe) nanoparticles exhibit enhanced magnetic anisotropy due to their nanoscale size and iron-rich surface. These findings highlight the potential for developing advanced soft magnetic materials.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Nanoparticles offer unique properties compared to bulk materials.
  • Tuning magnetic properties at the nanoscale is crucial for advanced applications.
  • Nickel-iron (NiFe) alloys are known for their soft magnetic characteristics.

Purpose of the Study:

  • To synthesize and characterize polytetrahedral NiFe nanoparticles.
  • To investigate the magnetic properties of these nanoparticles.
  • To understand the influence of size and surface composition on magnetic behavior.

Main Methods:

  • Hydrogenation of Ni[(COD)2] and Fe[N(SiMe3)2]2 precursors at 150°C.
  • Use of stearic acid and hexadecylamine as stabilizing ligands.
  • Characterization using X-ray absorption, Mössbauer spectroscopy, and magnetic measurements.

Main Results:

  • Successfully synthesized polytetrahedral NiFe nanoparticles (2.8±0.3 nm).
  • Nanoparticles exhibit superparamagnetism with a blocking temperature of 17.6 K.
  • Significantly enhanced magnetic anisotropy (2.7x10^5 J m^-3) compared to bulk NiFe.
  • Identical magnetization (1.69±0.05 μB/atom) to bulk NiFe.
  • Evidence of progressive iron enrichment from core to surface.

Conclusions:

  • The enhanced magnetic properties are attributed to the iron-enriched surface of the nanoparticles.
  • Size and chemical effects play a significant role in determining nanoscale magnetic behavior.
  • Feasible development of soft magnetic materials at the nanoscale is demonstrated.