Hysteretic properties of a magnetic particle with strong surface anisotropy
arXiv:cond-mat/0109411 · doi:10.1103/PhysRevB.66.174419
Abstract
We study the influence of surface anisotropy on the zero-temperature hysteretic properties of a small single-domain magnetic particle, and give an estimation of the anisotropy constant for which deviations from the Stoner-Wohlfarth model are observed due to non-uniform reversal of the particle's magnetisation. For this purpose, we consider a spherical particle with simple cubic crystalline structure, a uniaxial anisotropy for core spins and radial anisotropy on the surface. The hysteresis loop is obtained by solving the local (coupled) Landau-Lifschitz equations for classical spin vectors. We find that when the surface anisotropy constant is at least of the order of the exchange coupling, large deviations are observed with respect to the Stoner-Wohlfarth model in the hysteresis loop and thereby the limit-of-metastability curve, since in this case the magnetisation reverses its direction in a non-uniform manner via a progressive switching of spin clusters. In this case the critical field, as a function of the particle's size, behaves as observed in experiments.
12 pages, 15 eps figures
References in corpus (3)
Cited by in corpus (24)
- Surface contribution to the anisotropy of magnetic nanoparticles
- Spin Disorder and Magnetic Anisotropy in Fe3O4 Nanoparticles
- Effective anisotropies and energy barriers of magnetic nanoparticles with Neel surface anisotropy
- Surface-induced cubic anisotropy in nanomagnets
- Validity of the Néel-Arrhenius model for highly anisotropic Co_xFe_{3-x}O_4 nanoparticles
- Optimal switching of a nanomagnet assisted by microwaves
- Influence of surface anisotropy on the hysteresis of magnetic nanoparticles
- Effects of spin non-collinearities in magnetic nanoparticles
- Surface anisotropy in nanomagnets: transverse or Néel ?
- Effect of surface anisotropy on the hysteretic properties of a magnetic particle
- Magnetization of nanomagnet assemblies: Effects of anisotropy and dipolar interactions
- Thermal and surface anisotropy effects on the magnetization reversal of a nanocluster
- Effect of dipolar interactions and DC magnetic field on the specific absorption rate of an array of magnetic nanoparticles
- Effective anisotropy due to the surface of magnetic nanoparticles
- Shape and surface anisotropy effects on the hysteresis of ferrimagnetic nanoparticles
- Magnetic neutron scattering from spherical nanoparticles with Neel surface anisotropy: Atomistic simulations
- Beating the superparamagnetic size limit of nanoparticles on a ferroelectric substrate
- Influence of surface anisotropy on the magnetization reversal of nanoparticles
- Spatial magnetization profile in spherical nanomagnets with surface anisotropy: Green's function approach
- Vortex Polarity Switching in Magnets with Surface Anisotropy
- Surface induced magnetization reversal of MnP nanoclusters embedded in GaP
- Single-particle versus collective effects in assemblies of nanomagnets: screening
- Magnetoelastic Interactions Reduce Hysteresis in Soft Magnets
- Surface-induced reduction of the switching field in nanomagnets