Direct evidence for an interdiffused intermediate layer in bi-magnetic core-shell nanoparticles

Amélie Juhin, Alberto López-Ortega, Marcin Sikora, Claire Carvallo, Marta Estrader, Sònia Estradé, Francesca Peiró, Maria Dolors Baró, Philippe Sainctavit, Pieter Glatzel, Josep Nogués

Research output: Contribution to journalArticleResearchpeer-review

37 Citations (Scopus)

Abstract

© 2014 the Partner Organisations 2014. Core-shell nanoparticles attract continuously growing interest due to their numerous applications, which are driven by the possibility of tuning their functionalities by adjusting structural and morphological parameters. However, despite the critical role interdiffused interfaces may have in the properties, these are usually only estimated in indirect ways. Here we directly evidence the existence of a 1.1 nm thick (Fe,Mn)3O4 interdiffused intermediate shell in nominally γ-Fe2O3-Mn3O4 core-shell nanoparticles using resonant inelastic X-ray scattering spectroscopy combined with magnetic circular dichroism (RIXS-MCD). This recently developed magneto-spectroscopic probe exploits the unique advantages of hard X-rays (i.e., chemical selectivity, bulk sensitivity, and low self-absorption at the K pre-edge) and can be advantageously combined with transmission electron microscopy and electron energy loss spectroscopy to quantitatively elucidate the buried internal structure of complex objects. The detailed information on the structure of the nanoparticles allows understanding the influence of the interface quality on the magnetic properties.
Original languageEnglish
Pages (from-to)11911-11920
JournalNanoscale
Volume6
DOIs
Publication statusPublished - 1 Jan 2014

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