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Magnetochemistry 2016, 2(2), 27; doi:10.3390/magnetochemistry2020027

Multiple Magnetization Reversal Channels Observed in a 3d-4f Single Molecule Magnet

1
INSTM Research Unit and Dipartimento di Chimica ”U. Schiff”, Università di Firenze, Sesto Fiorentino (Fl) 50019, Italy
2
Departament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, E-08028 Barcelona, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Marius Andruh
Received: 26 April 2016 / Revised: 11 May 2016 / Accepted: 12 May 2016 / Published: 14 June 2016
(This article belongs to the Special Issue Magnetic Anisotropy)
View Full-Text   |   Download PDF [1369 KB, uploaded 14 June 2016]   |  

Abstract

The present study discusses the magnetic dynamics of a previously reported cyanide bridged 3d-4f dinuclear DyIIICoIII complex. Following the axial anisotropy suggested by previous Electron Paramagnetic Resonance spectroscopy (EPR) analysis, the complex turned out to show slow relaxation of the magnetization at cryogenic temperature, and this was studied in different temperature and field regimes. The existence of multichannel relaxation pathways that reverse the magnetization was clearly disclosed: a tentative analysis suggested that these channels can be triggered and controlled as a function of applied static magnetic field and temperature. Persistent evidence of a temperature independent process even at higher fields, attributable to quantum tunneling, is discussed, while the temperature dependent dynamics is apparently governed by an Orbach process. The broad distribution of relaxation rates evidenced by the ac susceptibility measurements suggest a relevant role of the intermolecular interactions in this system. View Full-Text
Keywords: lanthanides; slow relaxation of magnetization; single molecules magnets; relaxation pathways lanthanides; slow relaxation of magnetization; single molecules magnets; relaxation pathways
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Amjad, A.; Figuerola, A.; Caneschi, A.; Sorace, L. Multiple Magnetization Reversal Channels Observed in a 3d-4f Single Molecule Magnet. Magnetochemistry 2016, 2, 27.

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