Tuning the magnetic anisotropy and magnetotransport of self-assemblies of exchange coupled core/shell nanoparticles

FABRIS, FERNANDO; ENIO LIMA JR.; QUINTEROS, CYNTHIA; NEÑER, LUCAS; MARA GRANADA; MARTIN SIRENA; ROBERTO D. ZYSLER; LEBORÁN, VICTOR; RIVADULLA, FRANCISCO; ELIN WINKLER

Gijon

Conferencia; International Conference Fine Particle Magnetism; 2019

Universidad de Oviedo

The use of magnetic nanoparticles in different applications requires the fine control of the magnetic anisotropy of the system; while the development of novel permanent magnet and high density data storage demand hard magnetic materials, biomedical applications require superparamagnetic nanoparticles at room temperature. The fabrication of bimagnetic nanoparticles allows to combining materials with different magnetic order and anisotropy, and it extends the possibility of design new materials with suited properties. The core/shell structure also permit to combining different functionalities in a single nanoparticle as a magnetic conductor cores encapsulated with an insulator material. This possibility, together with the ability to form large areas of self-assembled nanoparticles, allows envisage future tunnel magnetotransport devices based on nanoparticles. Given that the anisotropy of the system is to a great extent responsible of the switching field of the tunnel magnetoresistance, assemblies of core/shell nanoparticles provides an ideal system to studying the spin-dependent transport between magnetic nanoparticles and also provides a tool to control the magnetoresistive response by tuning of the coercivity field of the magnetic nanoparticles.