title: Direct imaging of the magnetic polarity and reversal mechanism in individual Fe(3-x)O4 nanoparticles.
abstract: This work reports on the experimental characterization of the magnetic domain configurations in cubic, isolated Fe3-xO4 nanoparticles with a lateral size of 25-30 nm. The magnetic polarity at remanence of single domain ferrimagnetic Fe3-xO4 nanoparticles deposited onto a carbon-silicon wafer is observed by magnetic force microscopy. The orientations of these domains provide a direct observation of the magneto-crystalline easy axes in each individual nanoparticle. Furthermore, the change in the domain orientation with an external magnetic field gives evidence of particle magnetization reversal mediated by a coherent rotation process that is also theoretically predicted by micromagnetic calculations.
authors: Departament de Física Fonamental, Institut de Nanociència i Nanotecnologia, Universitat de Barcelona, Barcelona, 08028, Spain. cmoya@ffn.ub.es.
authors: Carlos
authors: C
authors: Moya
authors: Óscar
authors: Ó
authors: Iglesias-Freire
authors: Nicolás
authors: N
authors: Pérez
authors: Xavier
authors: X
authors: Batlle
authors: Amilcar
authors: A
authors: Labarta
authors: Agustina
authors: A
authors: Asenjo