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Quantum physics of ferromagnetic metal nanoparticles in an external magnetic field

Cehovin, Aleksander LU ; Canali, Carlo LU and MacDonald, A.H. (2002) Proceedings of 7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science (NANO-7/ECOSS-21) In 7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science
Abstract
We use a microscopic Slater-Koster tight-binding model to study the magnetic properties of ferromagnetic metal nanoparticles containing up to 260 atoms. We compute the total energy as a function of the magnetization direction and the ensuing magnetic anisotropy. In an external magnetic field, the ground-state energy as a function of the magnetization orientation is characterized by minima separated by energy barriers, in agreement with the results obtained using simple classical micromagnetic energy functional expressions with easy orientation directions. At a critical value of the external magnetic field, one of the local minima disappears, causing a re-orientation of the magnetization direction. Because of the magnetization reversal, the... (More)
We use a microscopic Slater-Koster tight-binding model to study the magnetic properties of ferromagnetic metal nanoparticles containing up to 260 atoms. We compute the total energy as a function of the magnetization direction and the ensuing magnetic anisotropy. In an external magnetic field, the ground-state energy as a function of the magnetization orientation is characterized by minima separated by energy barriers, in agreement with the results obtained using simple classical micromagnetic energy functional expressions with easy orientation directions. At a critical value of the external magnetic field, one of the local minima disappears, causing a re-orientation of the magnetization direction. Because of the magnetization reversal, the magnetic field dependence of the quasi-particle states displays an abrupt change at the switching field, similar to the field dependence of the discrete resonances observed in tunneling experiments on magnetic nanoparticles (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
ferromagnetic metal nanoparticles, quantum physics, external magnetic field, microscopic Slater-Koster tight binding model, magnetic properties, magnetization direction, magnetic anisotropy, ground state energy, magnetization orientation, simple classical micromagnetic energy functional expressions, critical value, easy orientation directions, switching field, tunneling experiments, discrete resonances, magnetization reversal, magnetic field dependence, quasiparticle states
in
7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science
pages
2 pages
publisher
Lund University
conference name
Proceedings of 7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science (NANO-7/ECOSS-21)
language
English
LU publication?
yes
id
276cc606-17dd-4a57-aa4c-ce12bae85b01 (old id 611142)
date added to LUP
2007-11-27 11:00:06
date last changed
2016-04-16 09:00:19
@misc{276cc606-17dd-4a57-aa4c-ce12bae85b01,
  abstract     = {We use a microscopic Slater-Koster tight-binding model to study the magnetic properties of ferromagnetic metal nanoparticles containing up to 260 atoms. We compute the total energy as a function of the magnetization direction and the ensuing magnetic anisotropy. In an external magnetic field, the ground-state energy as a function of the magnetization orientation is characterized by minima separated by energy barriers, in agreement with the results obtained using simple classical micromagnetic energy functional expressions with easy orientation directions. At a critical value of the external magnetic field, one of the local minima disappears, causing a re-orientation of the magnetization direction. Because of the magnetization reversal, the magnetic field dependence of the quasi-particle states displays an abrupt change at the switching field, similar to the field dependence of the discrete resonances observed in tunneling experiments on magnetic nanoparticles},
  author       = {Cehovin, Aleksander and Canali, Carlo and MacDonald, A.H.},
  keyword      = {ferromagnetic metal nanoparticles,quantum physics,external magnetic field,microscopic Slater-Koster tight binding model,magnetic properties,magnetization direction,magnetic anisotropy,ground state energy,magnetization orientation,simple classical micromagnetic energy functional expressions,critical value,easy orientation directions,switching field,tunneling experiments,discrete resonances,magnetization reversal,magnetic field dependence,quasiparticle states},
  language     = {eng},
  pages        = {2},
  publisher    = {ARRAY(0x901cc40)},
  series       = {7th International Conference on Nanometer-Scale Science and Technology and 21st European Conference on Surface Science},
  title        = {Quantum physics of ferromagnetic metal nanoparticles in an external magnetic field},
  year         = {2002},
}