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Butterfly hysteresis and slow relaxation of the magnetization in (Et₄N)₃Fe₂F₉ : manifestations of a single-molecule magnet

Schenker, R. and Leuenberger, M. N. and Chaboussant, G. and Gudel, H. U. and Loss, D.. (2002) Butterfly hysteresis and slow relaxation of the magnetization in (Et₄N)₃Fe₂F₉ : manifestations of a single-molecule magnet. Chemical physics letters, Vol. 358, H. 5-6. pp. 413-418.

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Official URL: http://edoc.unibas.ch/dok/A5254714

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Abstract

(Et4N)(3)Fe2F9 exhibits a butterfly-shaped hysteresis below 5 K when the magnetic field is parallel to the threefold axis, in accordance with a very slow magnetization relaxation in the timescale of minutes. This is attributed to an energy barrier Delta = 2.40 K resulting from the S = 5 dimer ground state of [Fe2F9](3-) and a negative axial anisotropy. The relaxation partly occurs via thermally assisted quantum tunneling. These features of a single-molecule magnet are observable at temperatures comparable to the barrier height. due to an extremely inefficient energy exchange between the spin system and the phonons. The butterfly shape of the hysteresis arises from a phonon avalanche effect.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik Mesoscopics (Loss)
UniBasel Contributors:Loss, Daniel
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:North Holland
ISSN:0009-2614
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:54

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