| Magnetostatic coupling in nanocrystalline magnetic materials Marcos De Campos1; 1UFF - FEDERAL FLUMINENSE UNIVERSITY, Volta Redonda, Brazil; PAPER: 433/Nanomaterials/Regular (Oral) SCHEDULED: 14:50/Sat. 26 Oct. 2019/Coralino ABSTRACT: Magnetic coupling can appear in samples with nanocrystalline structure, when two phases of different characteristics are mixed. In other, words, the coupling can happen when there are two phases: one magnetically hard and other magnetically soft. It is discussed the possiblity of occurrence of either, exchange coupling or magnetostatic coupling in nanocrystalline magnetic materials. Exchange coupling requires coherent lattice between the two phases. However, magnetostatic coupling can happen even for incoherent interfaces. As magnetostatic coupling is more general, and can happen in any situation of lattice coherency or incoherency, many of the observed coupling phenomena are due to magnetostatic interactions and not to exchange coupling. Criteria for occurrence of magnetostic coupling are discussed. Both phases should be single domain size, in order to happen magnetostatic coupling. |
