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Anisotropy in ferromagnetic nanoparticles: Level-to-level fluctuations of a collective effect

Publication ,  Journal Article
Usaj, G; Baranger, HU
Published in: Europhysics Letters
October 1, 2005

We calculate the mesoscopic fluctuations of the magnetic anisotropy of ferromagnetic nanoparticles; that is, the effect of single-particle interference on the direction of the collective magnetic moment. A microscopic spin-orbit Hamiltonian considered as a perturbation of the much stronger exchange interaction first yields an explicit expression for the anisotropy tensor. Then, assuming a simple random matrix model for the spin-orbit coupling allows us to describe the fluctuation of such a tensor analytically. In the case of uniaxial anisotropy, we calculate the distribution of the anisotropy constant for a given number of electrons, and its variation upon increasing this number by one. The magnitude of the latter scales inversely with the number of atoms in the particle and is sufficient to account for the experimental data. © EDP Sciences.

Duke Scholars

Published In

Europhysics Letters

DOI

ISSN

0295-5075

Publication Date

October 1, 2005

Volume

72

Issue

1

Start / End Page

110 / 116

Related Subject Headings

  • Fluids & Plasmas
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Usaj, G., & Baranger, H. U. (2005). Anisotropy in ferromagnetic nanoparticles: Level-to-level fluctuations of a collective effect. Europhysics Letters, 72(1), 110–116. https://doi.org/10.1209/epl/i2005-10210-4
Usaj, G., and H. U. Baranger. “Anisotropy in ferromagnetic nanoparticles: Level-to-level fluctuations of a collective effect.” Europhysics Letters 72, no. 1 (October 1, 2005): 110–16. https://doi.org/10.1209/epl/i2005-10210-4.
Usaj G, Baranger HU. Anisotropy in ferromagnetic nanoparticles: Level-to-level fluctuations of a collective effect. Europhysics Letters. 2005 Oct 1;72(1):110–6.
Usaj, G., and H. U. Baranger. “Anisotropy in ferromagnetic nanoparticles: Level-to-level fluctuations of a collective effect.” Europhysics Letters, vol. 72, no. 1, Oct. 2005, pp. 110–16. Scopus, doi:10.1209/epl/i2005-10210-4.
Usaj G, Baranger HU. Anisotropy in ferromagnetic nanoparticles: Level-to-level fluctuations of a collective effect. Europhysics Letters. 2005 Oct 1;72(1):110–116.
Journal cover image

Published In

Europhysics Letters

DOI

ISSN

0295-5075

Publication Date

October 1, 2005

Volume

72

Issue

1

Start / End Page

110 / 116

Related Subject Headings

  • Fluids & Plasmas
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 02 Physical Sciences
  • 01 Mathematical Sciences