Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/183287
Title: | Direct evidence of a graded magnetic interface in bi-magnetic core/shell nanoparticles using electron magnetic circular dichroism (e-MCD). |
Author: | Pozo Bueno, Daniel del Varela, María Estrader i Bofarull, Marta López-Ortega, Alberto Roca, Alejandro G. Nogués, Josep Peiró Martínez, Francisca Estradé Albiol, Sònia |
Keywords: | Nanopartícules Materials magnètics Dicroisme circular Nanoparticles Magnetic materials Circular dichroism |
Issue Date: | 9-Aug-2021 |
Publisher: | American Chemical Society |
Abstract: | nterfaces play a crucial role in composite magnetic materials and particularly in bimagnetic core/shell nanoparticles. However, resolving the microscopic magnetic structure of these nanoparticles is rather complex. Here, we investigate the local magnetization of antiferromagnetic/ferrimagnetic FeO/Fe3O4 core/shell nanocubes by electron magnetic circular dichroism (EMCD). The electron energy-loss spectroscopy (EELS) compositional analysis of the samples shows the presence of an oxidation gradient at the interface between the FeO core and the Fe3O4 shell. The EMCD measurements show that the nanoparticles are composed of four different zones with distinct magnetic moment in a concentric, onion-type, structure. These magnetic areas correlate spatially with the oxidation and composition gradient with the magnetic moment being largest at the surface and decreasing toward the core. The results show that the combination of EELS compositional mapping and EMCD can provide very valuable information on the inner magnetic structure and its correlation to the microstructure of magnetic nanoparticles. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1021/acs.nanolett.1c02089 |
It is part of: | Nano Letters, 2021, vol. 21, num. 16, p. 6923-6930 |
URI: | http://hdl.handle.net/2445/183287 |
Related resource: | https://doi.org/10.1021/acs.nanolett.1c02089 |
ISSN: | 1530-6984 |
Appears in Collections: | Articles publicats en revistes (Química Inorgànica i Orgànica) Articles publicats en revistes (Institut de Nanociència i Nanotecnologia (IN2UB)) |
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716075.pdf | 4.99 MB | Adobe PDF | View/Open |
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