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Chemical Science Vol - 3 Issue - 3

Chemical Science Vol - 3 Issue - 2

Chemical Science Vol -2

Chemical Science Vol -1

Direct observation of a ferri-to-ferromagnetic transition in a fluoride-bridged 3d–4f molecular cluster

Content Provider	Royal Society of Chemistry (RSC)
Author	Ali, Ehesan Piamonteze, Cinthia Schau-Magnussen, Magnus Waldmann, Oliver Bendix, Jesper Dreiser, Jan Brune, Harald Oppeneer, Peter Nolting, Frithjof Weihe, Høgni Salman, Zaher Thuesen, Christian Aa. Piligkos, Stergios Pedersen, Kasper S. Rusponi, Stefano Mutka, Hannu
Copyright Year	2012
Abstract	We report on the synthesis, crystal structure and magnetic characterisation of the trinuclear, fluoride-bridged, molecular nanomagnet [Dy(hfac)3(H2O)–CrF2(py)4–Dy(hfac)3(NO3)] (1) (hfacH = 1,1,1,5,5,5-hexafluoroacetylacetone, py = pyridine) and a closely related dinuclear species [Dy(hfac)4–CrF2(py)4]·½CHCl3 (2). Element-specific magnetisation curves obtained on 1 by X-ray magnetic circular dichroism (XMCD) allow us to directly observe the field-induced transition from a ferrimagnetic to a ferromagnetic arrangement of the Dy and Cr magnetic moments. By fitting a spin-Hamiltonian model to the XMCD data we extract a weak antiferromagnetic exchange coupling of j = −0.18 cm−1 between the DyIII and CrIII ions. The value found from XMCD is consistent with SQUID magnetometry and inelastic neutron scattering measurements. Furthermore, alternating current susceptibility and muon-spin relaxation measurements reveal that 1 shows thermally activated relaxation of magnetisation with a small effective barrier for magnetisation reversal of Δeff = 3 cm−1. Density-functional theory calculations show that the Dy–Cr couplings originate from superexchange via the fluoride bridges.
Starting Page	1024
Ending Page	1032
Page Count	9
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	3
Issue Number	4
Journal	Chemical Science
DOI	10.1039/c2sc00794k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hexafluoroacetylacetone Antiferromagnetism X-ray magnetic circular dichroism Properties of water SQUID Neutron diffraction Magnetometer Pyridine Fluoride Ferrimagnetism Nanomagnet Superexchange Ferromagnetism Alternating current
Content Type	Text
Resource Type	Article
Subject	Chemistry

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