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Chern numbers for spin models of transition metal nanomagnets

Canali, CM; Cehovin, Aleksander LU and MacDonald, AH (2003) In Physical Review Letters 91(4: 046805).
Abstract
We argue that ferromagnetic transition metal nanoparticles with fewer than approximately 100 atoms can be described by an effective Hamiltonian with a single giant spin degree of freedom. The total spin S of the effective Hamiltonian is specified by a Berry curvature Chern number that characterizes the topologically nontrivial dependence of a nanoparticle's many-electron wave function on magnetization orientation. The Berry curvatures and associated Chern numbers have a complex dependence on spin-orbit coupling in the nanoparticle and influence the semiclassical Landau-Liftshitz equations that describe magnetization-orientation dynamics.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
91
issue
4: 046805
publisher
American Physical Society
external identifiers
  • wos:000184372300042
  • scopus:0041379835
ISSN
1079-7114
DOI
language
English
LU publication?
yes
id
cac4ae55-8788-4119-ab1d-79a4905704d0 (old id 305160)
date added to LUP
2007-08-27 12:48:56
date last changed
2018-05-29 12:00:23
@article{cac4ae55-8788-4119-ab1d-79a4905704d0,
  abstract     = {We argue that ferromagnetic transition metal nanoparticles with fewer than approximately 100 atoms can be described by an effective Hamiltonian with a single giant spin degree of freedom. The total spin S of the effective Hamiltonian is specified by a Berry curvature Chern number that characterizes the topologically nontrivial dependence of a nanoparticle's many-electron wave function on magnetization orientation. The Berry curvatures and associated Chern numbers have a complex dependence on spin-orbit coupling in the nanoparticle and influence the semiclassical Landau-Liftshitz equations that describe magnetization-orientation dynamics.},
  author       = {Canali, CM and Cehovin, Aleksander and MacDonald, AH},
  issn         = {1079-7114},
  language     = {eng},
  number       = {4: 046805},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Chern numbers for spin models of transition metal nanomagnets},
  url          = {http://dx.doi.org/},
  volume       = {91},
  year         = {2003},
}