ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have modeled, in the framework of a micromagnetic approximation, the field evolution of the configuration of magnetic moments induced by the occurrence of interfacial exchange coupling at grain boundary regions. The models describe hard ferromagnetic polycrystals where secondary intergranular phases are present. Depending on the paramagnetic or soft ferromagnetic nature of the secondary phases, on the exchange to anisotropy ratio of the main phase and on the intensity of the exchange coupling at the interfaces the reversal, from a remanence state, of the magnetization of a linear chain of magnetic moments perpendicular to the interface takes place for demagnetizing fields which vary from the anisotropy field of the hard phase (grains decoupled by a thick paramagnetic layer) down to tenths of that field (coupling through a soft layer). The dependence of these phenomena on the thickness of the intergranular phases has been also examined.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.352442
