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Molecular Nanomagnets$
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Molecular Nanomagnets

Dante Gatteschi, Roberta Sessoli, and Jacques Villain

Print publication date: 2006

Print ISBN-13: 9780198567530

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780198567530.001.0001

THERMALLY ACTIVATED MAGNETIC RELAXATION

Chapter:
(p. 160 ) 5 THERMALLY ACTIVATED MAGNETIC RELAXATION
Source:
Molecular Nanomagnets
Author(s):

Dante Gatteschi

Roberta Sessoli

Jacques Villain

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198567530.003.0005

This chapter works out the thermally activated magnetic relaxation, which is responsible for the high temperature behaviour of the SMM. The concept of magnetic relaxation is correctly formalized and the role of phonons is described in detail to justify the observed thermal relaxation of the Arrhenius type. More exotic concepts like coherence and superradiance are introduced, taking into account the role of photons in the relaxation mechanism. The chapter concludes with a critical discussion on the validity of the suggested models.

Keywords:   spin-phonon, Arrhenius, coherence, superradiance photons

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