NDLI: Magnetic Anisotropy of Cyanide-Bridged Core and Core–Shell Coordination Nanoparticles Probed by X-ray Magnetic Circular Dichroism

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Magnetic Anisotropy of Cyanide-Bridged Core and Core–Shell Coordination Nanoparticles Probed by X-ray Magnetic Circular Dichroism

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sainctavit, Philippe Catala, Laure Prado, Yoann Volatron, Florence Mallah, Talal Otero, Edwige Arrio, Marie-anne Cartier Dit Moulin, Christophe
Description	Author Affiliation: Prado Y ( Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Sud 11, CNRS, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France. yoann.prado@gmail.com)
Abstract	The local symmetry and local magnetic properties of 6 nm-sized, bimetallic, cyanide-bridged $CsNiCr(CN)_{6}$ coordination nanoparticles 1 and 8 nm-sized, trimetallic, $CsNiCr(CN)_{6}@CsCoCr(CN)_{6}$ core–shell nanoparticles 2 were studied by X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD). The measurements were performed at the $Ni^{II},$ $Co^{II},$ and $Cr^{III}$ $L_{2,3}$ edges. This study revealed the presence of distorted $Ni^{II}$ sites located on the particle surface of 1 that account for the uniaxial magnetic anisotropy observed by SQUID measurements. For the core–shell particles, a combination of the exchange anisotropy between the core and the shell and the pronounced anisotropy of the $Co^{II}$ ions is the origin of the large increase in coercive field from 120 to 890 Oe on going from 1 to 2. In addition, XMCD allows the relative orientation of the magnetic moments throughout the core–shell particles to be determined. While for the bimetallic particles of 1, alignment of the magnetic moments of $Cr^{III}$ ions with those of $Ni^{II}$ ions leads to uniform magnetization, in the core–shell particles 2 the magnetic moments of the isotropic $Cr^{III}$ follow those of $Co^{II}$ ions in the shell and those of $Ni^{II}$ ions in the core, and this leads to nonuniform magnetization in the whole nanoobject, mainly due to the large difference in local anisotropy between the $Co^{II}$ ions belonging to the surface and the $Ni^{II}$ ions in the core.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	21
Volume Number	19
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2013-05-17
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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