Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8152991 | Journal of Magnetism and Magnetic Materials | 2018 | 39 Pages |
Abstract
Magnetic anisotropies and crystallographic structures of iron-cobalt nanospinels obtained with the co-precipitation synthesis process are revealed using X-ray Absorption Spectroscopy and X-ray Magnetic Circular Dichroism. The chemical process allows to obtain nanoparticles of various sizes and chemical composition, but it is the site symmetry environment of Co2+ that is found to be the crucial parameter that governs the magnetic anisotropies of the nanospinels. The distribution of Co2+ among the crystallographic sites of the structure is directly linked to the temperature of the synthesis process. In parallel, the results also revealed that a superficial rich shell of iron is formed for the iron-cobalt nanospinels stable in acidic medium leading to chemically inhomogeneous nanoparticles.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Niéli Daffé, Fadi Choueikani, Sophie Neveu, Marie-Anne Arrio, Amélie Juhin, Philippe Ohresser, Vincent Dupuis, Philippe Sainctavit,