Vortex core in a single NP

Switching the Magnetic Vortex Core in a Single Nanoparticle.
Elena Pinilla-Cienfuegos, Samuel Mañas-Valero, Alicia Forment-Aliaga, and Eugenio Coronado
ACS Nano 10, 1764 (2016)

Here we report the experimental observation of the vortex state formation and annihilation in individual 25 nm molecular-based magnetic nanoparticles measured by low-temperature variable-field magnetic force microscopy. Interestingly, in these nanoparticles the switching of the vortex core can be induced with very small values of the applied static magnetic field.