Dipolar ordering in a molecular nanomagnet detected using muon spin relaxation

Implanted muons have been used as a local probe to detect the magnetic ordering in the molecular magnetic nanodisk system Fe sub(19). Two distinct groups of muon sites are identified from the relaxation data, reflecting sites near the magnetic core and sites distributed over the rest of the molecule...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-04, Vol.89 (14), Article 144420
Main Authors: Pratt, F. L., Micotti, E., Carretta, P., Lascialfari, A., Arosio, P., Lancaster, T., Blundell, S. J., Powell, A. K.
Format: Article
Language:English
Subjects:
Computer simulation
Condensed matter
Level crossings
Magnetic properties
Monte Carlo methods
Muons
Nanostructure
Order disorder
Particle spin
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Summary:Implanted muons have been used as a local probe to detect the magnetic ordering in the molecular magnetic nanodisk system Fe sub(19). Two distinct groups of muon sites are identified from the relaxation data, reflecting sites near the magnetic core and sites distributed over the rest of the molecule. Dipole field calculations and Monte Carlo simulations confirm that the observed transition in Fe sub(19) is consistent with magnetic ordering driven by interactions between molecules that are predominantly dipolar in nature. The triclinic crystal structure of this system gives the dipolar field a significant component transverse to the easy spin axis and the parallel component provides a dipolar bias closely tuned to the first level crossing of the system. These factors enhance the quantum tunneling between levels, thus enabling the system to avoid spin freezing at low temperatures and efficiently reach the dipolar ordered state.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.89.144420