Exploring Anisotropy Contributions in Mn<sub><i>x</i></sub>Co<sub>1–<i>x</i></sub>Fe<sub>2</sub>O<sub>4</sub> Ferrite Nanoparticles for Biomedical Applications
Marianna Gerina, Marco Sanna Angotzi, Valentina Mameli, Michal Mazur, Nicoletta Rusta, Elena Balica, Pavol Hrubovčák, Carla Cannas, Dirk Honecker, Dominika Zákutná
Abstract
Designing well-defined magnetic nanomaterials is crucial for various applications, and it demands a comprehensive understanding of their magnetic properties at the microscopic level. In this study, we investigate the contributions to the total anisotropy of Mn/Co mixed spinel nanoparticles. By employing neutron measurements sensitive to the spatially resolved surface anisotropy with sub-Å space resolution, we reveal an additional contribution to the anisotropy constant arising from shape anisotropy and interparticle interactions. Our findings shed light on the intricate interplay among chemical composition, microstructure, morphology, and surface effects, providing valuable insights for the design of advanced magnetic nanomaterials for AC biomedical applications, such as cancer treatment by magnetic fluid hyperthermia.