Magnetization reversal in cobalt-surface-coated iron-oxide particles
- 1 January 1990
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 26 (1) , 231-233
- https://doi.org/10.1109/20.50543
Abstract
The reduced critical field h/sub n/ for magnetization reversal by curling of Co-surface-coated iron-oxide particles has been investigated in terms of the atomic layer model (ALM). The most simple case is a rectangular Co distribution (particle composed of a gamma -Fe/sub 2/O/sub 3/ core and a shell of CoFe/sub 2/O/sub 4/). In this case, the results agree very well with the curves calculated by A. Aharoni (J. Appl. Phys., vol.92, p.2576-7, 1987) in the frame of micromagnetism. Furthermore, the influence of Co diffusion into the particle core is taken into account. It turns out that h/sub n/ first increases considerably with proceeding diffusion. Depending on the anisotropy magnitude, the further alteration may be either positive or negative. This behavior offers the possibility to explain the different temperature dependences of the coercivity before and after annealing.Keywords
This publication has 7 references indexed in Scilit:
- Toward a model for Co-surface-treated Fe-oxidesIEEE Transactions on Magnetics, 1988
- Magnetization curling in coated particlesJournal of Applied Physics, 1987
- Magnetization Reversal by Curling in Terms of the Atomic Layer ModelPhysica Status Solidi (a), 1987
- On the coercivity of cobalt-ferrite epitaxial iron oxidesIEEE Transactions on Magnetics, 1981
- Critical Size and Nucleation Field of Ideal Ferromagnetic ParticlesPhysical Review B, 1957
- Magnetocrystalline anisotropy in cobalt-substituted magnetite single crystalsProceedings of the IEE - Part B: Radio and Electronic Engineering, 1957
- Anisotropy and Magnetostriction of Some FerritesPhysical Review B, 1955